chore(deps): update determinatesystems/magic-nix-cache-action action to v7 #6906

Job	Run time
Test with coverage	6m 45s
Extra checks	5m 5s
Javadoc quality	2m 37s
reproducible-builds	3m 22s
Tests with Java 17 on ubuntu-latest	6m 22s
Tests with Java 17 on windows-latest	10m 7s
Tests with Java 21 on ubuntu-latest	6m 26s
Codegeneration	1m 37s
maven-central-requirements	1m 9s
	43m 30s

Provide feedback