MT#57461 Ignore columns collation_name and character_set_name

In mariadb 10.6 utf8 was renamed to to utf8mb3:
https://jira.mariadb.org/browse/MDEV-8334

Now json files are built on mariadb 10.5 while on bookworm mariadb 10.11
is used. So until trunk is switched to bookworm we have to skip this
part.

Change-Id: I9a6c61a2250a61676df3dac7ed509442f39dd183

helper/compare_dbs.pl

@@ -48,6 +48,8 @@ my @diff_exceptions = qw(
     .+/accounting/cdr_[0-9]{6}/.+
 
     tables/.+/.+/table_collation
+    columns/.+/.+/.+/collation_name
+    columns/.+/.+/.+/character_set_name
 );
 
 my $credentials_file = '/etc/mysql/sipwise_extra.cnf';