Drop unknown pytest config option: strict (#537)
Drop unknown pytest config option: strict (#537)

Fixes the warning when running tests:

    .tox/.../lib/python3.9/site-packages/_pytest/config/__init__.py:1233
      .../pyjwt/.tox/.../lib/python3.9/site-packages/_pytest/config/__init__.py:1233: PytestConfigWarning: Unknown config option: strict

        self._warn_or_fail_if_strict(f"Unknown config option: {key}\n")
progrium/pyjwt,jpadilla/pyjwt