Bump actions/cache from 3 to 4 #856

Job	Run time
Book	1m 21s
Browser Test	2m 4s
Check on Rust 1.58 (macos)	11m 25s
Minimal Versions	38s
Check on Rust stable (macos)	1m 24s
Miri	2m 58s
Check on Rust beta (macos)	2m 9s
Test	1m 58s
Check on Rust nightly (macos)	2m 22s
Check on Rust 1.58 (ubuntu)	3m 31s
Check on Rust stable (ubuntu)	49s
Check on Rust beta (ubuntu)	1m 5s
Check on Rust nightly (ubuntu)	58s
Check on Rust 1.58 (windows)	5m 14s
Check on Rust stable (windows)	2m 56s
Check on Rust beta (windows)	2m 5s
Check on Rust nightly (windows)	2m 17s
	45m 14s

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