chore(ci): cache rust dependency #2211

Job	Run time
Check Style	19s
Verify hyper.h is up to date	1m 3s
features	47s
Check MSRV	4m 34s
Test with Miri	1m 36s
Test C API (FFI)	1m 19s
udeps	36s
Test stable on ubuntu-latest	2m 41s
Test stable on windows-latest	4m 0s
Test stable on macOS-latest	2m 32s
Test beta on ubuntu-latest	2m 4s
Test beta on windows-latest	4m 59s
Test beta on macOS-latest	3m 5s
Test nightly on ubuntu-latest	2m 20s
Test nightly on windows-latest	3m 56s
Test nightly on macOS-latest	2m 34s
Build docs	33s
Check exposed types	31s
CI is green	1s
	39m 30s

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