Experiment with alternate msys2 environments in CI workflow #227

Job	Run time
build-test (ubuntu-24.04, gcc, amd64)	19m 36s
build-test (ubuntu-24.04, gcc, c)	24m 59s
build-test (ubuntu-24.04, clang, amd64)	21m 22s
build-test (ubuntu-24.04, clang, c)	29m 12s
build-test (ubuntu-24.04, clang, llvm)	28m 15s
build-test (macos-13, clang, amd64)	54m 6s
build-test (macos-13, clang, c)	53m 0s
build-test (macos-13, clang, llvm)	55m 32s
build-test (macos-14, clang, c)	29m 58s
build-test (macos-14, clang, llvm)	35m 31s
build-test (windows-2022, mingw64, gcc, amd64)	43m 26s
build-test (windows-2022, mingw64, gcc, c)	47m 39s
build-test (windows-2022, ucrt64, gcc, amd64)	44m 7s
build-test (windows-2022, ucrt64, gcc, c)	49m 4s
build-test (windows-2022, clang64, clang, amd64)	1m 30s
build-test (windows-2022, clang64, clang, c)	1m 6s
build-test (windows-2022, clang64, clang, llvm)	1m 13s
	8h 59m 36s

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