Update copyright for 2021

Backpatch-through: 9.5

src/backend/utils/cache/attoptcache.c

@@ -6,7 +6,7 @@
  * Attribute options are cached separately from the fixed-size portion of
  * pg_attribute entries, which are handled by the relcache.
  *
- * 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/utils/cache/catcache.c

@@ -3,7 +3,7 @@
  * catcache.c
  *	  System catalog cache for tuples matching a key.
  *
- * 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/utils/cache/evtcache.c

@@ -3,7 +3,7 @@
  * evtcache.c
  *	  Special-purpose cache for event trigger data.
  *
- * 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/utils/cache/inval.c

@@ -89,7 +89,7 @@
  *	support the decoding of the in-progress transactions.  See
  *	CommandEndInvalidationMessages.
  *
- * 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/utils/cache/lsyscache.c

@@ -3,7 +3,7 @@
  * lsyscache.c
  *	  Convenience routines for common queries in the system catalog cache.
  *
- * 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/utils/cache/partcache.c

@@ -4,7 +4,7 @@
  *		Support routines for manipulating partition information cached in
  *		relcache
  *
- * 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/utils/cache/plancache.c

@@ -44,7 +44,7 @@
  * if the old one gets invalidated.
  *
  *
- * 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/utils/cache/relcache.c

@@ -3,7 +3,7 @@
  * relcache.c
  *	  POSTGRES relation descriptor cache code
  *
- * 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/utils/cache/relfilenodemap.c

@@ -3,7 +3,7 @@
  * relfilenodemap.c
  *	  relfilenode to oid mapping cache.
  *
- * 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/utils/cache/relmapper.c

@@ -28,7 +28,7 @@
  * all these files commit in a single map file update rather than being tied
  * to transaction commit.
  *
- * 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/utils/cache/spccache.c

@@ -8,7 +8,7 @@
  * be a measurable performance gain from doing this, but that might change
  * in the future as we add more options.
  *
- * 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/utils/cache/syscache.c

@@ -3,7 +3,7 @@
  * syscache.c
  *	  System cache management 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/utils/cache/ts_cache.c

@@ -17,7 +17,7 @@
  * any database access.
  *
  *
- * Copyright (c) 2006-2020, PostgreSQL Global Development Group
+ * Copyright (c) 2006-2021, PostgreSQL Global Development Group
  *
  * IDENTIFICATION
  *	  src/backend/utils/cache/ts_cache.c

src/backend/utils/cache/typcache.c

@@ -31,7 +31,7 @@
  * constraint changes are also tracked properly.
  *
  *
- * 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