Update commons-net to 3.11.1 #287

Job	Run time
initiate-java-modules	30s
test (kafka-connect-azure-eventhubs)	51s
test (kafka-connect-azure-servicebus)	49s
test (kafka-connect-common)	56s
test (kafka-connect-gcp-common)	52s
test (kafka-connect-gcp-pubsub)	1m 8s
test (kafka-connect-query-language)	48s
build-and-cache (kafka-connect-azure-eventhubs)	50s
build-and-cache (kafka-connect-azure-servicebus)	1m 2s
build-and-cache (kafka-connect-gcp-common)	1m 0s
build-and-cache (kafka-connect-gcp-pubsub)	1m 14s
jar-dependency-check (kafka-connect-azure-eventhubs)	29s
jar-dependency-check (kafka-connect-azure-servicebus)	35s
jar-dependency-check (kafka-connect-gcp-common)	29s
jar-dependency-check (kafka-connect-gcp-pubsub)	32s
(Java) Final Stage	1s
	12m 6s

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