test

Bump Swatinem/rust-cache from 1 to 2 #203

Job	Run time
Run the big ignored tests	1m 37s
32bit tests	34s
Clippy lints	25s
Check documentation links	16s
Check formatting	7s
Build & test (ubuntu-latest, stable)	34s
Build & test (ubuntu-latest, beta)	45s
Build & test (ubuntu-latest, nightly)	12s
Build & test (macos-latest, stable)	1m 43s
Build & test (macos-latest, beta)	1m 8s
Check it compiles on old Rust (1.31.0)	3m 33s
Build & test (macos-latest, nightly)	31s
Verify benchmarks compile	54s
Build & test (windows-latest, stable)	2m 15s
Miri checks	26s
Check it compiles on old Rust (1.45.0)	10s
Build & test (windows-latest, beta)	1m 42s
Build & test (windows-latest, nightly)	43s
Thread Sanitizer checks MacOS	43s
	18m 18s

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