CI worker msys2

Leave the run_cache in a good state after flush_all. #3378

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Run time

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Job	Run time
test (mingw64, x86_64, gcc)	4m 56s
test (ucrt64, ucrt-x86_64, gcc)	5m 5s
test (clang64, clang-x86_64, clang)	3m 28s
	13m 29s