Bump SystemIOAbstractionsVersion from 20.0.34 to 21.0.2 (#352) #622

Job	Run time
call-build-test (windows-latest) / build-and-test	3m 26s
call-build-test (macos-latest) / build-and-test	3m 4s
call-build-test (ubuntu-latest) / build-and-test	1m 36s
call-release / release	0s
call-deploy / deploy	43s
	8m 49s

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