Fix filter predicate example parent version

Author: xiangfu0

pinot-plugins/pinot-filter-predicate-example/pom.xml

@@ -25,7 +25,7 @@
   <parent>
     <artifactId>pinot-plugins</artifactId>
     <groupId>org.apache.pinot</groupId>
-    <version>1.5.0-SNAPSHOT</version>
+    <version>1.6.0-SNAPSHOT</version>
   </parent>
   <artifactId>pinot-filter-predicate-example</artifactId>
   <name>Pinot Custom Filter Predicate Example Plugin</name>