macOS

Remove clang-18 from compilers CI #697

Job	Run time
make (check, macos-14, --with-jemalloc --with-opt-dir=$(brew --prefix jemalloc))	7m 20s
make (check, macos-14, --with-gmp)	8m 18s
make (check, macos-14, --with-gcc=gcc-14)	9m 29s
make (test-bundled-gems, macos-14)	10m 55s
make (check, macos-14)	8m 0s
make (test-all, --repeat-count=2, macos-14)	11m 45s
make (test-bundler-parallel, macos-14)	17m 32s
make (check, macos-15, capi)	6m 18s
macOS result	4s
	1h 19m 41s

Provide feedback