improve: don't run sonar on dependabit PRs (#3243) #6650

Job	Run time
sample_operators_tests (sample-operators/mysql-schema)	2m 36s
sample_operators_tests (sample-operators/tomcat-operator)	2m 49s
sample_operators_tests (sample-operators/webpage)	3m 1s
sample_operators_tests (sample-operators/leader-election)	3m 22s
sample_operators_tests (sample-operators/metrics-processing)	7m 30s
	19m 18s

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