Fixing sonar warnings #253

Job	Run time
Windows (JDK 8)	15m 55s
Linux (JDK 8), latest Guava, America/New_York Timezone	11m 18s
Linux (JDK 8), oldest Guava, America/New_York Timezone	10m 41s
Windows (JDK 17)	13m 46s
Linux (JDK 11), Avatica main	11m 54s
Linux (JDK 11), Pacific/Chatham Timezone	9m 31s
Linux (JDK 17)	9m 30s
Linux (JDK 19)	9m 10s
Error Prone (JDK 11), latest Guava	3m 38s
CheckerFramework (JDK 11)	9m 42s
CheckerFramework (JDK 11), oldest Guava	9m 39s
Druid Tests	6m 54s
macOS (JDK 19)	33m 13s
Linux (JDK 8) Slow Tests	0s
	2h 34m 51s

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