Bump version to 0.2.0-alpha.8 #440

Job	Run time
Check generated C header	29s
Generate documentation	21s
Benchmark	9m 24s
Build [ubuntu-latest, 1.65.0, dev, --workspace]	3m 14s
Build [ubuntu-latest, 1.65.0, release, --workspace]	5m 0s
Lint with clippy	45s
No-op rebuilds	30s
Build [ubuntu-latest, stable, dev, --workspace]	28s
Check code formatting	21s
Build [ubuntu-latest, stable, release, --workspace]	44s
Test and coverage	1m 46s
Test with release build	1m 18s
Build [macos-latest, 1.65.0, dev, --workspace]	5m 24s
Build [macos-latest, 1.65.0, release, --workspace]	6m 21s
Test with address sanitizer	2m 10s
Build [macos-latest, stable, dev, --workspace]	36s
Test with leak sanitizer	3m 17s
Build [macos-latest, stable, release, --workspace]	1m 7s
Build [ubuntu-latest, stable, dev, --no-default-features]	23s
	43m 38s

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