mariadb: Increase innodb_io_capacity from 500 to 1000

[paladox]

We use SSDs/NVME. I'm not sure why I lowered it to 500 in #4051 which doesn't make sense as we use a NVME. Increase it.

[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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