Bump actions/cache from 3 to 4 #4875

Job	Run time
Check tket library version	15s
Build and test (tket) (ubuntu-22.04)	1m 8s
Build and test pytket (windows)	14m 42s
Build and test (tket) (macos-12)	2m 16s
Build and test pytket (ubuntu)	7m 22s
Build and test pytket (macos) (macos-12)	11m 28s
Build and test (tket) (macos-13-xlarge)	1m 17s
Build and test pytket (macos) (macos-13-xlarge)	3m 54s
Build and test (tket) (windows-2022)	6m 7s
Check documentation build	44s
Check C++ code formatting	57s
Publish pytket coverage	0s
Check pytket line and branch coverage	5s
All build and test jobs successful (or skipped)	1s
	50m 16s

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