Bump cdap.plugin.version to 2.12.1

Author: psainics

pom.xml

@@ -73,7 +73,7 @@
     <bigquery.connector.hadoop2.version>hadoop2-1.2.0</bigquery.connector.hadoop2.version>
     <commons.codec.version>1.4</commons.codec.version>
     <cdap.version>6.9.1</cdap.version>
-    <cdap.plugin.version>2.11.1</cdap.plugin.version>
+    <cdap.plugin.version>2.12.1</cdap.plugin.version>
     <dropwizard.metrics-core.version>3.2.6</dropwizard.metrics-core.version>
     <flogger.system.backend.version>0.7.1</flogger.system.backend.version>
     <gcs.connector.version>hadoop2-2.2.9</gcs.connector.version>