9.1.0
fix approx rel for timedelta: accept float, compute rel * expected (#14466)
testing: avoid legacy forms of `warns`, `raises`, `deprecated_call`
Add `pytest.register_fixture`
Comply with new lint rule for unused variables
fixtures: deprecate global None fixture visibility
Fix -v hint in raises match diff not working (#14226)
Style: Use type.__name__ in raises error messages for consistency (#13862)
fixtures: exclude direct-param fixtures from --fixtures-per-test output