Since last week `wptserve/tests/functional/test_server.py::TestH2Version::test_http_version` test fails on almost every run, e.g., [here](https://github.com/web-platform-tests/wpt/pull/51784), [here](https://github.com/web-platform-tests/wpt/pull/51812) or [here](https://github.com/web-platform-tests/wpt/pull/51908).
