ci: Remove some things from `env` #5235

Job	Run time
Ensure `Cargo.lock` contains all required dependencies	6s
toolchains	3s
check (ubuntu-latest, 1.76.0, debug)	3m 13s
check (ubuntu-latest, stable, debug)	3m 21s
check (ubuntu-latest, nightly, debug)	5m 26s
check (macos-latest, 1.76.0, debug)	2m 59s
check (macos-latest, stable, debug)	2m 35s
check (macos-latest, nightly, debug)	4m 50s
check (windows-latest, 1.76.0, debug)	6m 22s
check (windows-latest, stable, debug)	6m 30s
check (windows-latest, nightly, debug)	11m 11s
check (ubuntu-latest, stable, release)	5m 9s
bench / Benchmark	23m 8s
	1h 14m 53s

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