Update DeterminateSystems/magic-nix-cache-action action to v14 #97

Job	Run time
Build scip-java CLI	3m 51s
maven-kotlin-json-kotlin-maven	2m 38s
gradle-mixed-okio-jmh	4m 23s
gradle-kotlin-okio	4m 30s
maven-java25-demo	2m 44s
maven-java17-spring-boot	1m 35s
gradle-java21-readiness	1m 46s
gradle-kotlin-flowext	4m 10s
bazel-java-examples	3m 14s
	28m 51s

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