chore(deps): bump com.diffplug.spotless:spotless-maven-plugin from 3.0.0 to 3.1.0 #5961

Job	Run time
sample_operators_tests (sample-operators/tomcat-operator)	3m 52s
sample_operators_tests (sample-operators/webpage)	4m 6s
sample_operators_tests (sample-operators/leader-election)	4m 41s
sample_operators_tests (sample-operators/mysql-schema)	3m 29s
	16m 8s

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