[libc++][CI] Adds a new CMake version in Docker. #71582
Merged
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This allows testing the upcoming CMake 3.28 release in the CI. CMake 3.28 will have non-experimental support for C++20 modules. So this would be a better CMake version for the modular builds.
The goal is to remove CMake 3.27 from the CI when the builder work properly with 3.28.