Merge pull request #20 from jenkinsci/update-core-version

update core to 2.426.3

Author: mawinter69

pom.xml

@@ -26,7 +26,7 @@
 
   <properties>
     <changelist>999999-SNAPSHOT</changelist>
-    <jenkins.version>2.426.1</jenkins.version>
+    <jenkins.version>2.426.3</jenkins.version>
     <hpi.compatibleSinceVersion>17</hpi.compatibleSinceVersion>
   </properties>