Update CI away from unsupported actions. #342

Job	Run time
Rust format	1m 10s
Rust check	1m 15s
Rust check (--all-features)	1m 15s
Rust check (macOS-latest)	1m 25s
Rust check (windows-latest)	1m 48s
Rust lint	1m 8s
Check CLI	1m 13s
Rust lint (--all-features)	1m 9s
Rust check and lint benchmarks	21s
Check sync readme	1m 19s
Rust lint (stable)	16s
Rust doc	1m 22s
Rust lint (stable, --all-features)	17s
Rust test	1m 35s
Rust lint (beta)	20s
Rust lint (beta, --all-features)	23s
Rust lint (nightly)	15s
Rust lint (nightly, --all-features)	24s
Coverage	2m 32s
	19m 27s

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