HARK build on MacOS, Ubuntu and Windows

Remove unused .gitmodules file (#1368) #2361

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Run time

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Job	Run time
build (ubuntu-latest, 3.8)	8m 45s
build (ubuntu-latest, 3.9)	9m 19s
build (ubuntu-latest, 3.10)	8m 59s
build (macos-latest, 3.8)	7m 54s
build (macos-latest, 3.9)	12m 32s
build (macos-latest, 3.10)	6m 51s
build (windows-latest, 3.8)	15m 29s
build (windows-latest, 3.9)	14m 10s
build (windows-latest, 3.10)	14m 51s
	1h 38m 50s