Experiment with alternate msys2 environments in workflows #221

Job	Run time
build-test (ubuntu-24.04, gcc, amd64)	19m 40s
build-test (ubuntu-24.04, gcc, c)	25m 4s
build-test (ubuntu-24.04, clang, amd64)	21m 18s
build-test (ubuntu-24.04, clang, c)	27m 28s
build-test (ubuntu-24.04, clang, llvm)	27m 58s
build-test (macos-13, clang, amd64)	52m 37s
build-test (macos-13, clang, c)	56m 53s
build-test (macos-13, clang, llvm)	48m 37s
build-test (macos-14, clang, c)	32m 4s
build-test (macos-14, clang, llvm)	24m 26s
build-test (windows-2022, mingw64, gcc, amd64)	41m 35s
build-test (windows-2022, mingw64, gcc, c)	47m 1s
build-test (windows-2022, ucrt64, gcc, amd64)	43m 40s
build-test (windows-2022, ucrt64, gcc, c)	52m 56s
build-test (windows-2022, clang64, clang, amd64)	38m 46s
build-test (windows-2022, clang64, clang, c)	41m 48s
build-test (windows-2022, clang64, clang, llvm)	43m 50s
	10h 45m 41s

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