enum.Flag: default for boundary is incorrect

[huwcbjones]

In c9480d5 the default was changed from STRICT to CONFORM, but the docs were never updated to reflect this.
See https://docs.python.org/3.11/library/enum.html#enum.FlagBoundary

STRICT
Out-of-range values cause a ValueError to be raised. This is the default for Flag:

Linked PRs

• gh-101739: update docs - default boundary for enum.Flag is CONFORM not STRICT #101746
• [3.11] gh-101739: [Enum] update docs - default boundary for Flag is CONFORM (GH-101746) #102004

[hauntsaninja]

Thanks!