HTTPMethod missing from astroid http brain

[joao-faria-dev]

I saw this issue opened on pylint saying that class 'HTTPMethod' has no '__members__' when accessing HTTPMethod.__members__, even though HTTPMethod is a valid StrEnum introduced in Python 3.11 and has __members__ at runtime

This is happening because HTTPMethod is missing from astroid/brain/brain_http.py

I'll open a PR fixing that