Mysql2::Error: Unsupported charset: '"utf8mb3"'

Hello,

after upgrading to Mariadb 10.6, I've encountered this issue:

Mysql2::Error: Unsupported charset: '"utf8mb3"'
/var/www/example_s/shared/bundle/ruby/3.2.0/gems/mysql2-0.5.5/lib/mysql2/client.rb:49:in `charset_name='
/var/www/example_s/shared/bundle/ruby/3.2.0/gems/mysql2-0.5.5/lib/mysql2/client.rb:49:in `initialize'

I think the issue is due to the fact that utf8mb3 is not in mysql2_mysql_enc_name_to_rb_map (

mysql2/ext/mysql2/mysql_enc_name_to_ruby.h

Line 99 in b439a89

static const struct mysql2_mysql_enc_name_to_rb_map wordlist[] =

).

MariaDB changed the default utf8 to be named utf8mb3 in 10.6 (https://mariadb.com/kb/en/unicode/) and MySQL will changed it in MySQL 8.0.28 (https://dev.mysql.com/doc/refman/8.0/en/charset-unicode-utf8mb3.html).
To be future compatible, it would be nice to use utf8mb3 as encoding.

Unfortunately I feel not be able to create a good PR for it. It would be nice if someone could add this in the future.

Thanks!