Fix auth tests and ruff format

[ihrpr]

We started running tests in parallel and this uncovered, strangely see this only in local run.

oauth_provider fixture in the test file is defined as an async fixture (async def oauth_provider), but two tests were trying to use it as a synchronous fixture:

1. test_has_valid_token_expired - was a synchronous test (def test_...) but used the async oauth_provider fixture
2. test_scope_priority_no_scope - was also a synchronous test but used the async oauth_provider fixture

This caused an AttributeError because pytest was passing a coroutine object instead of the actual OAuthClientProvider instance to these tests. When the tests tried to access attributes like oauth_provider._current_tokens, they failed because coroutine objects don't have these attributes.

The fix was to make both tests async by:

• Adding @pytest.mark.anyio decorator
• Changing def test_... to async def test_...

Also noticed that out CI does not catch ruff format so adding it here