Bump actions/cache from 3 to 4 #857

Job	Run time
Book	1m 20s
Browser Test	2m 0s
Check on Rust 1.58 (macos)	9m 50s
Minimal Versions	40s
Check on Rust stable (macos)	1m 25s
Check on Rust beta (macos)	1m 43s
Check on Rust nightly (macos)	1m 44s
Miri	3m 3s
Check on Rust 1.58 (ubuntu)	3m 31s
Check on Rust stable (ubuntu)	59s
Check on Rust beta (ubuntu)	56s
Test	1m 58s
Check on Rust nightly (ubuntu)	57s
Check on Rust 1.58 (windows)	5m 9s
Check on Rust stable (windows)	2m 58s
Check on Rust beta (windows)	1m 52s
Check on Rust nightly (windows)	1m 59s
	42m 4s

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