[clang] [libclang/python] Make the value of a true bool enum 1, not -1 (PR #221497)

[Jannick Kremer via cfe-commits]

DeinAlptraum wrote:

Thanks for the report & fix PR!
Change itself LGTM. Please also add a brief release note about the bugfix
Also cc @Endilll 

https://github.com/llvm/llvm-project/pull/221497