Update verapdf version

Author: MaximPlusov

pom.xml

@@ -7,7 +7,7 @@
     <parent>
         <artifactId>verapdf-parent</artifactId>
         <groupId>org.verapdf</groupId>
-        <version>1.29.6</version>
+        <version>1.31.1</version>
     </parent>
 
     <groupId>org.verapdf</groupId>
@@ -37,7 +37,7 @@
     </modules>
 
     <properties>
-        <verapdf.version>[1.29.0,1.30.0-RC)</verapdf.version>
+        <verapdf.version>[1.31.0,1.32.0-RC)</verapdf.version>
     </properties>
 
     <repositories>