add type hints (Python 3.11)

conftest.py

@@ -1,10 +1,11 @@
 import pytest
+from typing import Any
 
 
-def pytest_addoption(parser):
+def pytest_addoption(parser: pytest.Parser) -> None:
     parser.addoption("--relaxed", action='store_true', help="run tests in relaxed mode")
 
 
 @pytest.fixture
-def relaxed(request):
+def relaxed(request: pytest.FixtureRequest) -> Any:
     return request.config.getoption("--relaxed")