feat: use Cubic CC by default #5460

Job	Run time
Ensure `Cargo.lock` contains all required dependencies	4s
toolchains	3s
check (ubuntu-latest, 1.76.0, debug)	3m 8s
check (ubuntu-latest, stable, debug)	2m 57s
check (ubuntu-latest, nightly, debug)	5m 0s
check (macos-latest, 1.76.0, debug)	3m 24s
check (macos-latest, stable, debug)	2m 28s
check (macos-latest, nightly, debug)	5m 36s
check (windows-latest, 1.76.0, debug)	7m 4s
check (windows-latest, stable, debug)	7m 17s
check (windows-latest, nightly, debug)	10m 53s
check (ubuntu-latest, stable, release)	5m 4s
bench / Benchmark	22m 54s
	1h 15m 52s

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