Update copyright for 2021

Backpatch-through: 9.5

src/backend/storage/lmgr/condition_variable.c

@@ -8,7 +8,7 @@
  *	  interrupted, unlike LWLock waits.  Condition variables are safe
  *	  to use within dynamic shared memory segments.
  *
- * 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/storage/lmgr/condition_variable.c

src/backend/storage/lmgr/deadlock.c

@@ -7,7 +7,7 @@
  * detection and resolution algorithms.
  *
  *
- * 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/storage/lmgr/generate-lwlocknames.pl

@@ -1,7 +1,7 @@
 #!/usr/bin/perl
 #
 # Generate lwlocknames.h and lwlocknames.c from lwlocknames.txt
-# Copyright (c) 2000-2020, PostgreSQL Global Development Group
+# Copyright (c) 2000-2021, PostgreSQL Global Development Group
 
 use strict;
 use warnings;

src/backend/storage/lmgr/lmgr.c

@@ -3,7 +3,7 @@
  * lmgr.c
  *	  POSTGRES lock manager 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/storage/lmgr/lock.c

@@ -3,7 +3,7 @@
  * lock.c
  *	  POSTGRES primary lock mechanism
  *
- * 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/storage/lmgr/lwlock.c

@@ -20,7 +20,7 @@
  * appropriate value for a free lock.  The meaning of the variable is up to
  * the caller, the lightweight lock code just assigns and compares it.
  *
- * 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/storage/lmgr/predicate.c

@@ -135,7 +135,7 @@
  *		- Protects both PredXact and SerializableXidHash.
  *
  *
- * 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/storage/lmgr/proc.c

@@ -3,7 +3,7 @@
  * proc.c
  *	  routines to manage per-process shared memory data structure
  *
- * 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/storage/lmgr/s_lock.c

@@ -36,7 +36,7 @@
  * the probability of unintended failure) than to fix the total time
  * spent.
  *
- * 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/storage/lmgr/spin.c

@@ -11,7 +11,7 @@
  * is too slow to be very useful :-(
  *
  *
- * 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
  *
  *