[libc++] Fix problems with GCC 13 and switch to it in the CI

Reviewed By: #libc, #libc_abi, Mordante

Spies: arphaman, Mordante, libcxx-commits, arichardson

Differential Revision: https://reviews.llvm.org/D157060

GitOrigin-RevId: f29c54998d236c36f047d39aee76c79f933ba363
1 file changed