Fauna python doesn't support HTTPX > 0.27.*

[ryancausey]

There is a new release of HTTPX that bumps the version to 0.28.0. However, fauna-python requires HTTPX < 0.28.0. Please add support for the HTTPX 0.28.* series.

[cynicaljoy]

@ryancausey this is available now in 2.4.0