ci: remove `CARGO_FEATURES_OPTION` #342

Job	Run time
cargo clippy -- -D warnings (ubuntu-latest)	25s
cargo check (ubuntu-latest)	6s
cargo clippy -- -D warnings (macOS-latest)	14s
GNU test suite	32s
cargo fmt --all -- --check	7s
cargo check (macOS-latest)	11s
cargo check (windows-latest)	34s
cargo clippy -- -D warnings (windows-latest)	1m 32s
cargo test (ubuntu-latest)	40s
cargo test (macOS-latest)	3m 6s
Code Coverage (ubuntu-latest, unix)	2m 7s
cargo test (windows-latest)	4m 2s
Code Coverage (macos-latest, macos)	2m 17s
Code Coverage (windows-latest, windows)	6m 58s
	22m 51s

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