Bump actions/download-artifact from 3 to 4 #1727

Job	Run time
Dependabot / Automerge PRs	3s
Build / Compile Assets	49s
Docs / Generate	5m 29s
Build / Detect Clean Versions	3s
Test / Check Credo	4m 18s
Test / Generate Dialyzer PLT	8m 32s
Test / Check Formatting	3m 31s
Test / Gettext Translations up-to-date	5m 14s
Test / Sobelow Job	45s
Test / Run Tests & Submit Coverage	8m 10s
Build / Mix Release	4m 2s
Build / Docker Build	0s
Docs / Upload	0s
Test / Check Dialyzer	2m 38s
	43m 34s

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