[clang] [libclang/python] Renaming `get_version` into `get_clang_version` (PR #188515)

[Jannick Kremer via cfe-commits]

https://github.com/DeinAlptraum commented:

The release note should also be adapted to reflect the changed name

https://github.com/llvm/llvm-project/blob/main/clang/docs/ReleaseNotes.rst#python-binding-changes

https://github.com/llvm/llvm-project/pull/188515