Update MinGW CI to Ubuntu 20.04 #2873

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Run time

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Job	Run time
mingw32	1m 5s
mingw32	10m 31s
linux	1m 4s
linux	10m 49s
macos	1m 7s
macos	14m 11s
mingw64	1m 5s
mingw64	13m 31s
msvc-x86	1m 7s
msvc-x86	11m 13s
msvc-x64	1m 7s
msvc-x64	10m 48s
	1h 17m 38s