overrides: add hash for ruff 0.1.{13,14,15}, update test

[fpletz]

Also adds a warning if no hash is found to prevent an evaluation error. This enables to override the source.

Contribution checklist (recommended but not always applicable/required):

• There's an automated test for this change
• Commit messages or code include references to related issues or PRs (including third parties)
• Commit messages are conventional - examples from the log include "feat: add changelog files to fixup hook", "fix(contourpy): allow wheel usage", and "test: add sqlalchemy2 test"

[fpletz]

Build failure is unrelated to this PR since poetry is broken on unstable. Fixed by NixOS/nixpkgs#280522.

[moretea]

Lovely! Could you merge @fpletz ?

[fpletz]

Unfortunately I don't have commit access to this repo.