databases/py-mariadb: Update 1.1.11 => 1.1.12

Changelog:
Callback functions for session or fetch callbacks didn't work properly
when passing connection->thread_state in threaded environment.
Instead we acquire and release the GIL explicitly in these callback
functions.
https://github.com/mariadb-corporation/mariadb-connector-python/releases/tag/v1.1.12

PR: 286243
MFH: 2025Q2
(cherry picked from commit a176fb5fb6a5168af2961d2d6922d9dfc38edd1d)