go1.22: Re-enable lints

[aarongable]

As usual, golangci-lint hasn't been updated to work in go1.22 yet, so we have to skip it when running tests against the go1.22 release candidates.

https://github.com/letsencrypt/boulder/pull/7226 makes test.sh's lint checks conditional on the go version. We need to remember to remove this conditional when we fully switch over to go1.22.