Switch to bootstrap 4 because 5 breaks menus #5310

Job	Run time
mingw (mingw64)	4m 18s
mingw (ucrt64)	4m 19s
build (windows-2019, Win32, v142, 17, Debug)	1m 54s
build (windows-2019, Win32, v142, 17, Release)	2m 37s
build (windows-2019, Win32, v142, 17, -DBUILD_SHARED_LIBS=ON, Debug)	1m 3s
build (windows-2019, Win32, v142, 17, -DBUILD_SHARED_LIBS=ON, Release)	1m 47s
build (windows-2019, x64, v140, 14, Debug)	1m 32s
build (windows-2019, x64, v140, 14, Release)	1m 47s
build (windows-2019, x64, v141, 17, Debug)	1m 45s
build (windows-2019, x64, v141, 17, Release)	2m 22s
build (windows-2019, x64, v142, 17, Debug)	1m 24s
build (windows-2019, x64, v142, 17, Release)	2m 15s
build (windows-2019, x64, v142, 17, -DBUILD_SHARED_LIBS=ON, Debug)	1m 26s
build (windows-2019, x64, v142, 17, -DBUILD_SHARED_LIBS=ON, Release)	2m 7s
build (windows-2019, x64, v142, 20, Debug)	2m 19s
build (windows-2019, x64, v142, 20, Release)	2m 42s
build (windows-2022, x64, v143, Debug, 20)	2m 0s
	37m 37s

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