Update dependency org.apache.flink:flink-contrib to v1.20.0

Author: renovate[bot]

flink-contrib/flink-connector-wikiedits/pom.xml

@@ -25,7 +25,7 @@ under the License.
 	<parent>
 		<groupId>org.apache.flink</groupId>
 		<artifactId>flink-contrib</artifactId>
-		<version>1.19.1</version>
+		<version>1.20.0</version>
 	</parent>
 
 	<artifactId>flink-connector-wikiedits</artifactId>