Bump version to v3.8.0 #2011

Job	Run time
Rustfmt (stable)	7s
clippy_check (ubuntu-latest, stable)	24s
Build and Test (ubuntu-latest, 1.65)	2m 25s
clippy_check (ubuntu-latest, nightly)	29s
Build and Test (ubuntu-latest, 1.70)	2m 2s
clippy_check (windows-latest, stable)	1m 19s
Build and Test (ubuntu-latest, 1.75)	1m 57s
clippy_check (windows-latest, nightly)	1m 5s
Build and Test (ubuntu-latest, stable)	5m 55s
Build and Test (ubuntu-latest, beta)	1m 1s
Build and Test (ubuntu-latest, nightly)	1m 38s
Build and Test (windows-latest, 1.65)	3m 36s
Build and Test (windows-latest, 1.70)	2m 49s
Build and Test (windows-latest, 1.75)	2m 52s
Build and Test (windows-latest, stable)	3m 0s
Build and Test (windows-latest, beta)	2m 46s
Build and Test (windows-latest, nightly)	2m 40s
Tests result	1s
	36m 6s

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