Use literals in place of `HTTPStatus` constants in tests (#13463)

changelog.d/13463.misc

tests/federation/test_complexity.py

tests/federation/transport/test_knocking.py

tests/handlers/test_deactivate_account.py

tests/handlers/test_message.py

tests/handlers/test_room_member.py

tests/http/server/_base.py

tests/rest/client/test_filter.py

tests/rest/client/test_login.py

tests/rest/client/test_redactions.py

tests/rest/client/test_register.py

tests/rest/client/test_report_event.py

tests/rest/client/test_third_party_rules.py

tests/rest/client/utils.py

tests/rest/test_health.py

tests/rest/test_well_known.py

tests/test_server.py

tests/test_terms_auth.py