[clang-tools-extra] [clang-tidy] bugprone-unhandled-self-assignment: fix smart pointer check against std::unique_ptr type (PR #121266)

[via cfe-commits]

flovent wrote:

> please add release note in `clang-tools-extra/docs/ReleaseNotes.rst` alphabetically.

done. 
And yes, i don't have write access, can you merge it? @HerrCai0907 

https://github.com/llvm/llvm-project/pull/121266