Bump msys2/setup-msys2 from 2.25.0 to 2.26.0 #7841

Job	Run time
build (windows-2019, Win32, v142, 17, Debug)	1m 43s
build (windows-2019, Win32, v142, 17, Release)	1m 54s
mingw (mingw64)	4m 8s
build (windows-2019, Win32, v142, 17, -DBUILD_SHARED_LIBS=ON, Debug)	1m 24s
mingw (ucrt64)	4m 9s
build (windows-2019, Win32, v142, 17, -DBUILD_SHARED_LIBS=ON, Release)	2m 14s
build (windows-2019, x64, v141, 14, Debug)	1m 19s
build (windows-2019, x64, v141, 14, Release)	2m 30s
build (windows-2019, x64, v141, 17, Debug)	1m 39s
build (windows-2019, x64, v141, 17, Release)	2m 7s
build (windows-2019, x64, v142, 17, Debug)	1m 23s
build (windows-2019, x64, v142, 17, Release)	2m 32s
build (windows-2019, x64, v142, 17, -DBUILD_SHARED_LIBS=ON, Debug)	1m 25s
build (windows-2019, x64, v142, 17, -DBUILD_SHARED_LIBS=ON, Release)	2m 8s
build (windows-2019, x64, v142, 20, Debug)	1m 28s
build (windows-2019, x64, v142, 20, Release)	2m 36s
build (windows-2022, x64, v143, Debug, 20)	1m 37s
	36m 16s

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