mariadb: remove innodb_thread_concurrency

[paladox]

This was deprecated in mariadb 10.5.5 and then removed 10.6. We're using MariaDB 10.11+ so no longer need this.

[coderabbitai]

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch paladox-patch-3

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