[RELEASE-6.9.2] Revert CDAP dependency bump

Author: dli357

pom.xml

@@ -72,7 +72,7 @@
     <avro.version>1.8.2</avro.version>
     <bigquery.connector.hadoop2.version>hadoop2-1.0.0</bigquery.connector.hadoop2.version>
     <commons.codec.version>1.4</commons.codec.version>
-    <cdap.version>6.9.2</cdap.version>
+    <cdap.version>6.9.1</cdap.version>
     <cdap.plugin.version>2.11.0</cdap.plugin.version>
     <dropwizard.metrics-core.version>3.2.6</dropwizard.metrics-core.version>
     <flogger.system.backend.version>0.3.1</flogger.system.backend.version>