Update verapdf-parent pom.xml version to 1.29.6

Author: LonelyMidoriya

pom.xml

@@ -27,7 +27,7 @@
   <parent>
     <artifactId>verapdf-parent</artifactId>
     <groupId>org.verapdf</groupId>
-    <version>1.29.1</version>
+    <version>1.29.6</version>
   </parent>
 
   <artifactId>verapdf-integration-tests</artifactId>