Update dependency org.apache.maven.plugins:maven-assembly-plugin to v2.6

Author: renovate[bot]

pom.xml

@@ -35,7 +35,7 @@
 
 
     <plugin.version.deploy>3.1.4</plugin.version.deploy>
-    <plugin.version.assembly>2.4.1</plugin.version.assembly>
+    <plugin.version.assembly>2.6</plugin.version.assembly>
     <plugin.version.ejb>2.4</plugin.version.ejb>
     <plugin.version.war>2.4</plugin.version.war>
     <plugin.version.ear>2.9.1</plugin.version.ear>