databases/mariadb-java-client: Update 3.5.6 => 3.5.8

Release notes:
https://mariadb.com/docs/release-notes/connectors/java/3.5/3.5.7
https://mariadb.com/docs/release-notes/connectors/java/3.5/3.5.8

PR: 294351
Sponsored by: UNIS Labs
MFH: 2026Q2

(cherry picked from commit 7e547c2bc2e1d37d863f17d06e8bdddd7e31480b)