Update copyright for 2021

Backpatch-through: 9.5

src/backend/access/transam/clog.c

@@ -23,7 +23,7 @@
  * for aborts (whether sync or async), since the post-crash assumption would
  * be that such transactions failed anyway.
  *
- * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  * src/backend/access/transam/clog.c

src/backend/access/transam/commit_ts.c

@@ -15,7 +15,7 @@
  * re-perform the status update on redo; so we need make no additional XLOG
  * entry here.
  *
- * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  * src/backend/access/transam/commit_ts.c

src/backend/access/transam/generic_xlog.c

@@ -4,7 +4,7 @@
  *	 Implementation of generic xlog records.
  *
  *
- * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  * src/backend/access/transam/generic_xlog.c

src/backend/access/transam/multixact.c

@@ -59,7 +59,7 @@
  * counter does not fall within the wraparound horizon considering the global
  * minimum value.
  *
- * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  * src/backend/access/transam/multixact.c

src/backend/access/transam/parallel.c

@@ -3,7 +3,7 @@
  * parallel.c
  *	  Infrastructure for launching parallel workers
  *
- * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  * IDENTIFICATION

src/backend/access/transam/slru.c

@@ -38,7 +38,7 @@
  * by re-setting the page's page_dirty flag.
  *
  *
- * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  * src/backend/access/transam/slru.c

src/backend/access/transam/subtrans.c

@@ -19,7 +19,7 @@
  * data across crashes.  During database startup, we simply force the
  * currently-active page of SUBTRANS to zeroes.
  *
- * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  * src/backend/access/transam/subtrans.c

src/backend/access/transam/timeline.c

@@ -21,7 +21,7 @@
  * The fields are separated by tabs. Lines beginning with # are comments, and
  * are ignored. Empty lines are also ignored.
  *
- * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  * src/backend/access/transam/timeline.c

src/backend/access/transam/transam.c

@@ -3,7 +3,7 @@
  * transam.c
  *	  postgres transaction (commit) log interface routines
  *
- * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  *

src/backend/access/transam/twophase.c

@@ -3,7 +3,7 @@
  * twophase.c
  *		Two-phase commit support functions.
  *
- * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  * IDENTIFICATION

src/backend/access/transam/twophase_rmgr.c

@@ -3,7 +3,7 @@
  * twophase_rmgr.c
  *	  Two-phase-commit resource managers tables
  *
- * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  *

src/backend/access/transam/varsup.c

@@ -3,7 +3,7 @@
  * varsup.c
  *	  postgres OID & XID variables support routines
  *
- * Copyright (c) 2000-2020, PostgreSQL Global Development Group
+ * Copyright (c) 2000-2021, PostgreSQL Global Development Group
  *
  * IDENTIFICATION
  *	  src/backend/access/transam/varsup.c

src/backend/access/transam/xact.c

@@ -5,7 +5,7 @@
  *
  * See src/backend/access/transam/README for more information.
  *
- * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  *

src/backend/access/transam/xlog.c

@@ -4,7 +4,7 @@
  *		PostgreSQL write-ahead log manager
  *
  *
- * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  * src/backend/access/transam/xlog.c

src/backend/access/transam/xlogarchive.c

@@ -4,7 +4,7 @@
  *		Functions for archiving WAL files and restoring from the archive.
  *
  *
- * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  * src/backend/access/transam/xlogarchive.c

src/backend/access/transam/xlogfuncs.c

@@ -7,7 +7,7 @@
  * This file contains WAL control and information functions.
  *
  *
- * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  * src/backend/access/transam/xlogfuncs.c

src/backend/access/transam/xloginsert.c

@@ -9,7 +9,7 @@
  * of XLogRecData structs by a call to XLogRecordAssemble(). See
  * access/transam/README for details.
  *
- * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  * src/backend/access/transam/xloginsert.c

src/backend/access/transam/xlogreader.c

@@ -3,7 +3,7 @@
  * xlogreader.c
  *		Generic XLog reading facility
  *
- * Portions Copyright (c) 2013-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 2013-2021, PostgreSQL Global Development Group
  *
  * IDENTIFICATION
  *		src/backend/access/transam/xlogreader.c

src/backend/access/transam/xlogutils.c

@@ -8,7 +8,7 @@
  * None of this code is used during normal system operation.
  *
  *
- * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  * src/backend/access/transam/xlogutils.c