Build

Bump spotbugs to 4.8.2 #3727

Job	Run time
build	1m 53s
lighty_rnc_app_test / build	7m 46s
lighty_rcgnmi_app_test / build	7m 3s
lighty_rnc_cluster_app_test / build	8m 30s
	25m 12s

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