Make all Perl warnings fatal, catch-up

Apply c538592959 to new Perl files that had missed the note.

src/common/unicode/generate-unicode_case_table.pl

@@ -9,7 +9,7 @@
 # Copyright (c) 2000-2024, PostgreSQL Global Development Group
 
 use strict;
-use warnings;
+use warnings FATAL => 'all';
 use Getopt::Long;
 
 use FindBin;