chore(deps): bump com.diffplug.spotless:spotless-maven-plugin from 3.3.0 to 3.4.0 #6646

Job	Run time
sample_operators_tests (sample-operators/webpage)	3m 17s
sample_operators_tests (sample-operators/metrics-processing)	18m 26s
sample_operators_tests (sample-operators/mysql-schema)	3m 21s
sample_operators_tests (sample-operators/leader-election)	3m 40s
sample_operators_tests (sample-operators/tomcat-operator)	3m 9s
	31m 53s

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