testing/ruff: upgrade to 0.0.284

1 test failed:

thread 'message::gitlab::tests::output' panicked at 'Could not diff paths', crates/ruff/src/fs.rs:75:14

Could it be due to the CI_PROJECT_DIR environment variable?

I checked the last testing/ruff merge request (!46453 (merged)) and the pipeline failed there as well, but i can't view the CI logs to confirm if this was the same test that failed as they have been archived.

Since May this has been upgraded without going through the Gitlab CI, so i checked the last build log, and this test doesn't seem to have any problem on the builder.