Enable pgdriver connection check

[htdvisser]

Summary

#5674 adds connection checking to the Identity Server database connection pool (for the pgx database driver). Once https://github.com/uptrace/bun/pull/635 lands in a release, we should also enable that for the pgdriver database driver.

Current Situation

#5674 adds connection checks to the database connection pool, but only for the pgx driver, and leaves a TODO for the pgdriver driver.

https://github.com/uptrace/bun/pull/635 was merged, but did not land in a pgdriver release yet.

Desired Situation

Upgrade the pgdriver dependency when there's a new release, un-comment the code and remove the TODO.

Code of Conduct

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