Deprecation for os-string #210

Job	Run time
i386	4m 46s
darwin_arm (self-hosted, macOS, ARM64, 8.10.7)	1s
arm (arm32v7)	4m 18s
darwin_arm (self-hosted, macOS, ARM64, 9.2.6)	1s
build (ubuntu-latest, 8.0.2, 3.8.1.0)	33m 20s
arm (arm64v8)	4m 5s
darwin_arm (self-hosted, macOS, ARM64, 9.4.4)	1s
build (ubuntu-latest, 8.2.2, 3.8.1.0)	8m 22s
build (ubuntu-latest, 8.4.4, 3.8.1.0)	5m 53s
build (ubuntu-latest, 8.6.5, 3.8.1.0)	5m 55s
build (ubuntu-latest, 8.8.4, 3.8.1.0)	5m 41s
build (ubuntu-latest, 8.10.7, 3.8.1.0)	6m 39s
build (ubuntu-latest, 9.0.2, 3.8.1.0)	5m 49s
build (ubuntu-latest, 9.2.7, 3.8.1.0)	4m 7s
build (ubuntu-latest, 9.4.5, 3.8.1.0)	4m 49s
build (ubuntu-latest, 9.6.1, 3.8.1.0)	4m 54s
build (macOS-latest, 9.4.5, 3.8.1.0)	25m 16s
build (macOS-latest, 9.6.1, 3.8.1.0)	14m 1s
build (windows-latest, 9.4.5, 3.8.1.0)	16m 6s
build (windows-latest, 9.6.1, 3.8.1.0)	17m 37s
	2h 51m 41s

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