[Misc] Bump taichi version to v1.8.0 #18916

Job	Run time
Check files	11s
Show Environment Variables	9s
Build and Test (manylinux2014)	11m 56s
Check Static Analyzer	16m 2s
Build and Test (Docs)	3m 41s
Build and Test macos (CPU) (macos-10.15, 3.7, ON, cpu,vulkan)	11m 49s
Build and Test (Apple M1) (macos-latest, 3.8)	18m 11s
Build and Test (GPU) (sm70, driver470)	16m 55s
Build and Test (GPU) (sm70, driver510)	14m 39s
Build iOS C-API Static Library	4m 30s
Build and Test Windows (sm70)	26m 17s
Build and Test Windows (not sm70)	41m 54s
Build and Test (GPU) (not sm70, driver470)	29m 2s
Build and Test (GPU) (not sm70, driver510)	55m 0s
AOT Build and Test Android Apps	9m 51s
AOT Build and Test Android Headless Demos	6m 8s
AOT Build and Test Android Unity Examples	6m 14s
AOT Build and Test (GPU) (self-hosted, cuda, vulkan, cn, driver470)	6m 13s
Build and Test (AMDGPU)	10m 23s
AOT Build and Test (GPU) (self-hosted, cuda, vulkan, cn, driver510)	6m 12s
	4h 55m 17s

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