ci: fix rust-cache config #523

Job	Run time
coverage	6m 28s
Rustfmt	23s
docs	2m 46s
lint	3m 43s
Rust unit tests (ubuntu-latest)	4m 55s
Rust unit tests (macos-latest)	7m 22s
Rust unit tests (windows-latest)	7m 45s
typecheck	2m 9s
test (macos-latest, 3.7)	9m 29s
test (macos-latest, 3.8)	7m 38s
test (macos-latest, 3.9)	9m 49s
test (macos-latest, 3.10)	9m 55s
test (macos-latest, 3.11)	9m 36s
test (ubuntu-latest, 3.7)	8m 20s
test (ubuntu-latest, 3.8)	7m 8s
test (ubuntu-latest, 3.9)	6m 54s
test (ubuntu-latest, 3.10)	7m 47s
test (ubuntu-latest, 3.11)	5m 54s
test (windows-latest, 3.7)	7m 53s
test (windows-latest, 3.8)	10m 27s
test (windows-latest, 3.9)	8m 19s
test (windows-latest, 3.10)	6m 23s
	2h 31m 3s

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