[Build] Lift macOS min compat version to Big Sur #19275

Job	Run time
Check files	8s
Show Environment Variables	9s
Check Static Analyzer	11m 22s
Build and Test (AMDGPU)	8m 50s
Build and Test macos (CPU) (macos-10.15, 3.11, ON, cpu,vulkan)	6m 37s
Build and Test (GPU) (sm70, driver550)	11m 30s
Build and Test (GPU) (not sm70, driver550)	11m 27s
Build and Test (Docs)	1m 3s
Build and Test Windows (sm70)	11m 25s
Build and Test (Apple M1) (macos-latest, 3.8)	11m 31s
Build and Test Windows (not sm70)	11m 21s
Build iOS C-API Static Library	3m 25s
AOT Build and Test Android Headless Demos	1m 53s
AOT Build and Test Android Apps	8m 17s
AOT Build and Test Android Unity Examples	3m 12s
AOT Build and Test (GPU) (self-hosted, cuda, vulkan, cn, driver550)	2m 48s
	1h 44m 58s

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