Nikolas Klauser e52ce7f554 [libc++] Remove old CI configurations and update the supported compiler versions
`_LIBCPP_REMOVE_TRANSITIVE_INCLUDES` doesn't do anything anymore in C++23 mode, so it's now just a duplicate of the C++23 configuration.
Also add new steps to the post-release checklist for updating the supported compilers.

Reviewed By: ldionne, #libc

Spies: arichardson, libcxx-commits, arphaman

Differential Revision: https://reviews.llvm.org/D133364
2023-01-20 06:04:35 +01:00
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