Update example with correct dependency

Author: mzitnik

examples/maven/covid/pom.xml

@@ -76,8 +76,8 @@ under the License.
 		</dependency>
 
 		<dependency>
-			<groupId>org.apache.flink.connector</groupId>
-			<artifactId>clickhouse</artifactId>
+			<groupId>com.clickhouse.flink</groupId>
+			<artifactId>flink-connector-clickhouse-2.0.0</artifactId>
 			<version>0.0.1</version>
 			<classifier>all</classifier>
 		</dependency>