Build

Bump spotbugs-maven-plugin to 4.8.6.4 #1037

Job	Run time
build	15m 40s
lighty_rcgnmi_app_test / build	8m 48s
lighty_rnc_app_test / build	6m 33s
lighty_rnc_cluster_app_test / build	8m 8s
	39m 9s

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