chore(deps): bump actions/cache from 5 to 6 (#3439) #7321

Job	Run time
sample_operators_tests (sample-operators/leader-election)	4m 50s
sample_operators_tests (sample-operators/tomcat-operator)	4m 3s
sample_operators_tests (sample-operators/mysql-schema)	3m 58s
sample_operators_tests (sample-operators/webpage)	4m 34s
sample_operators_tests (sample-operators/operations)	9m 4s
	26m 29s

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