Update DB Support Docs

[google-labs-jules]

Updated the mariadb_support.md and mysql_support.md files to reflect the latest end-of-life information from endoflife.date.

Added new versions and updated the status of existing versions based on the latest data.

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PR created automatically by Jules for task 14719633381745422293 started by @jmrenouard

[google-labs-jules]

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