Bump actions/cache from 3 to 4 #1731

Job	Run time
Build / Compile Assets	44s
Dependabot / Automerge PRs	5s
Docs / Generate	5m 4s
Build / Detect Clean Versions	5s
Test / Check Credo	4m 14s
Test / Generate Dialyzer PLT	8m 51s
Test / Check Formatting	3m 21s
Test / Gettext Translations up-to-date	4m 55s
Test / Sobelow Job	49s
Test / Run Tests & Submit Coverage	8m 5s
Build / Mix Release	6m 5s
Docs / Upload	0s
Build / Docker Build	0s
Test / Check Dialyzer	4m 10s
	46m 28s

Provide feedback