Updating drools pdp dependencies

Issue-ID: POLICY-2387
Change-Id: I5fe17c2514aed5c595d4e2a3d95fbb210a6f229b
Signed-off-by: RossC <ross.carter@est.tech>
diff --git a/policy-management/pom.xml b/policy-management/pom.xml
index 92d8d92..fb96fd7 100644
--- a/policy-management/pom.xml
+++ b/policy-management/pom.xml
@@ -4,7 +4,7 @@
   ONAP Policy Engine - Drools PDP
   ================================================================================
   Copyright (C) 2017-2020 AT&T Intellectual Property. All rights reserved.
-  Modifications Copyright (C) 2019 Nordix Foundation.
+  Modifications Copyright (C) 2020 Nordix Foundation.
   ================================================================================
   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
@@ -222,7 +222,7 @@
             <artifactId>gson-javatime-serialisers</artifactId>
             <version>1.1.1</version>
         </dependency>
-        
+
         <dependency>
             <groupId>com.jayway.jsonpath</groupId>
             <artifactId>json-path</artifactId>
@@ -231,7 +231,7 @@
         <dependency>
             <groupId>org.apache.commons</groupId>
             <artifactId>commons-collections4</artifactId>
-            <version>4.1</version>
+            <version>4.4</version>
         </dependency>
 
         <!-- if we don't explicitly specify the version here, we seem to end up