chore(ci): cache rust dependency (#3353) #2212

Job	Run time
Check Style	15s
Verify hyper.h is up to date	1m 32s
Check MSRV	4m 35s
features	1m 6s
Test with Miri	1m 42s
Test C API (FFI)	49s
udeps	41s
Test stable on ubuntu-latest	2m 31s
Test stable on windows-latest	5m 13s
Test stable on macOS-latest	1m 57s
Test beta on ubuntu-latest	2m 11s
Test beta on windows-latest	3m 57s
Test beta on macOS-latest	3m 12s
Test nightly on ubuntu-latest	2m 17s
Test nightly on windows-latest	3m 52s
Test nightly on macOS-latest	3m 8s
Check exposed types	1m 16s
Build docs	31s
CI is green	1s
	40m 46s

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