Remove security issue xstream and plexus-utils

Some of these were ommitted from compile while others
were not completely ommitted.

Upgraded maven-compiler since it upgraded plexus-utils

Upgraded latest version of jackson-databind 2.9.5

Issue-ID: POLICY-507
Change-Id: If92ff4355329c48fbe76e0245d6c8344ebb8084d
Signed-off-by: Pamela Dragosh <pdragosh@research.att.com>
diff --git a/PolicyEngineUtils/pom.xml b/PolicyEngineUtils/pom.xml
index 73b6e04..85b506a 100644
--- a/PolicyEngineUtils/pom.xml
+++ b/PolicyEngineUtils/pom.xml
@@ -70,7 +70,7 @@
 		<dependency>
 			<groupId>org.apache.maven</groupId>
 			<artifactId>maven-model</artifactId>
-			<version>3.3.9</version>
+			<version>3.5.3</version>
 		</dependency>
 		<!--
 		CLM security fix - force use of xstream