[libc++] Update macOS and AppleClang (#193711)

The new AppleClang is only available on macOS 26, so we need to update
both.

GitOrigin-RevId: 6810a69ab8a61873dbdfff2c2949a3a701419cde
1 file changed
tree: 4c525f5ea50c80535c5dd02fe46755eb7942f204
  1. cmake/
  2. docs/
  3. include/
  4. src/
  5. test/
  6. .clang-format
  7. CMakeLists.txt
  8. LICENSE.TXT