JCR-4451: update jar-plugin dependency to 3.1.2

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/trunk@1861777 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/jackrabbit-parent/pom.xml b/jackrabbit-parent/pom.xml
index 4f3253e..77a1b7b 100644
--- a/jackrabbit-parent/pom.xml
+++ b/jackrabbit-parent/pom.xml
@@ -296,7 +296,7 @@
         </plugin>
         <plugin>
           <artifactId>maven-jar-plugin</artifactId>
-          <version>3.1.1</version>
+          <version>3.1.2</version>
         </plugin>
         <plugin>
           <artifactId>maven-war-plugin</artifactId>