ci: add rust-cache action #1407

Job	Run time
Test (windows-latest)	26m 2s
Compiletest (windows-latest)	18m 35s
Android (ubuntu-latest, aarch64-linux-android)	8m 45s
Lint	5m 51s
Difftest (windows-latest)	22m 28s
Difftest (macOS-latest)	14m 54s
Test (macOS-latest)	22m 27s
Difftest (ubuntu-latest)	12m 24s
cargo-deny	1m 9s
Compiletest (ubuntu-latest)	8m 16s
Compiletest (macOS-latest)	13m 19s
Test (ubuntu-latest)	14m 55s
test_success	2s
cargo-deny	1m 24s
Difftest (ubuntu-latest)	8m 48s
Android (ubuntu-latest, aarch64-linux-android)	2m 32s
Lint	5m 47s
Difftest (macOS-latest)	11m 15s
Compiletest (ubuntu-latest)	6m 28s
Difftest (windows-latest)	17m 7s
Compiletest (windows-latest)	15m 28s
Test (windows-latest)	11m 59s
Test (ubuntu-latest)	5m 33s
Test (macOS-latest)	8m 59s
Compiletest (macOS-latest)	6m 19s
test_success	2s
	4h 30m 48s

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