[libcxx-commits] [libcxx] [libc++][NFC] Mark LWG3884 as complete in C++26 issues status (PR #195819)

[A. Jiang via libcxx-commits]

https://github.com/frederick-vs-ja approved this pull request.

I slightly reworded the PR message which will be used as the squashed commit message by default. Please double-check.

The CI failure is unrelated and has been fixed by #195786.

https://github.com/llvm/llvm-project/pull/195819