Ban the broken faker version

Fix #1323 (closed)

This Merge Request includes:

• Tests (all the ones that pass now)
• A changelog fragment (cf https://docs.funkwhale.audio/contributing.html#changelog-management)

This makes a lot more of the tests pass for me. You have to delete the broken Funkwhale testing container that dev.yml made manually, though; it doesn't seem to pick up that it needs a rebuild if you just docker-compose to run the tests again.