Bump version to v3.8.0 (#734) #2012

Job	Run time
Rustfmt (stable)	22s
clippy_check (ubuntu-latest, stable)	32s
Build and Test (ubuntu-latest, 1.65)	2m 34s
clippy_check (ubuntu-latest, nightly)	29s
Build and Test (ubuntu-latest, 1.70)	2m 1s
clippy_check (windows-latest, stable)	2m 27s
Build and Test (ubuntu-latest, 1.75)	1m 45s
clippy_check (windows-latest, nightly)	1m 4s
Build and Test (ubuntu-latest, stable)	5m 47s
Build and Test (ubuntu-latest, beta)	59s
Build and Test (ubuntu-latest, nightly)	1m 47s
Build and Test (windows-latest, 1.65)	3m 21s
Build and Test (windows-latest, 1.70)	2m 57s
Build and Test (windows-latest, 1.75)	3m 0s
Build and Test (windows-latest, stable)	3m 52s
Build and Test (windows-latest, beta)	2m 36s
Build and Test (windows-latest, nightly)	3m 8s
Tests result	1s
	38m 42s

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