Increasing the data type from char(32) to char(64) for
the following system columns:

- mysql.event.collation_connection
- mysql.event.db_collation
- mysql.proc.collation_connection
- mysql.proc.db_collation

This change was forgotten during MDEV-27009.

Also fixing the comment "Start/End of 10.9 tests" in ctype_utf8_uca.test
to "Start/End of 10.10 tests", as MDEV-27009 was actually
released in 10.10.