Remove unused property

Now that we moved to policy/parent, this property isn't
necessary in this repo.

Found this as I was looking into mariadb security issues
for both drools-pdp and engine.

Issue-ID: POLICY-1059
Change-Id: If06e00608fe7f76314c233e806fca5d9150734ae
Signed-off-by: Pamela Dragosh <pdragosh@research.att.com>
diff --git a/pom.xml b/pom.xml
index 076eb3f..e442077 100644
--- a/pom.xml
+++ b/pom.xml
@@ -66,7 +66,6 @@
 
         <!-- Shared between policy/* project repositories - different version -->
         <eclipselink.version>2.6.0</eclipselink.version>
-        <mariadb.jdbc.version>1.2.3</mariadb.jdbc.version>
 
         <!-- Project common dependency versions -->
         <javax.persistence.api.version>1.0.2</javax.persistence.api.version>