Update COPYING date to now and fix some [skip CI]

src/analyzer/protocol/postgresql/postgresql.evt

@@ -1,3 +1,5 @@
+# See the file "COPYING" in the main distribution directory for copyright.
+
 import PostgreSQL;
 import PostgreSQL_Zeek;
 

src/analyzer/protocol/postgresql/postgresql.spicy

@@ -1,3 +1,5 @@
+# See the file "COPYING" in the main distribution directory for copyright.
+#
 # A PostgreSQL analyzer.
 #
 # https://www.postgresql.org/docs/current/protocol.html

src/analyzer/protocol/postgresql/postgresql_zeek.spicy

@@ -1,3 +1,5 @@
+# See the file "COPYING" in the main distribution directory for copyright.
+#
 # Set up protocol confirmation/rejection for analyzers, as well as any further
 # Zeek-specific analysis.