CI worker msys2

Eliminate some more unsynchronized changes to the run object. #3362

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Run time

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Job	Run time
test (mingw64, x86_64, gcc)	4m 57s
test (ucrt64, ucrt-x86_64, gcc)	4m 55s
test (clang64, clang-x86_64, clang)	3m 17s
	13m 9s