[chore] Silence maxprocs logging

[daenney]

Description

This switches the logger to Debug. By default the library logs things internally despite returning errors. Due to the way we had it hooked up this resulted in scary error level logs being emitted for innocuous errors. Now those errors will only be visible in debug mode.

Fixes: #1398
Relates to: #1336

Checklist

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• I/we have read the GoToSocial contribution guidelines.
• I/we have discussed the proposed changes already, either in an issue on the repository, or in the Matrix chat.
• I/we have performed a self-review of added code.
• I/we have written code that is legible and maintainable by others.
• I/we have commented the added code, particularly in hard-to-understand areas.
• I/we have made any necessary changes to documentation.
• I/we have added tests that cover new code.
• I/we have run tests and they pass locally with the changes.
• I/we have run go fmt ./... and golangci-lint run.

[daenney]

I went for Debug so we can still get the logs it emits just in case. I'm happy to mute it entirely with a no-op logger too.

[tsmethurst]

That looks good to me :)