Pass salt as bytes when testing pbkdf2_hex...* wqflask/tests/unit/wqflask/test_pbkdf2.py (test_pbkdf2_hex): Make
password salt bytes. Breaking change introduced in 0bac313ba.
Replace mockobject with dataclasses...* wqflask/tests/unit/wqflask/test_markdown_routes.py
(MockRequests404): Use dataclasses.
(MockRequests200): Ditto.