chore: update jenkins baseline to 2.516 (#202)

Author: krisstern

pom.xml

@@ -35,8 +35,8 @@
     <revision>1.39</revision>
     <changelist>-SNAPSHOT</changelist>
     <!-- https://www.jenkins.io/doc/developer/plugin-development/choosing-jenkins-baseline/ -->
-    <jenkins.baseline>2.504</jenkins.baseline>
-    <jenkins.version>${jenkins.baseline}.1</jenkins.version>
+    <jenkins.baseline>2.516</jenkins.baseline>
+    <jenkins.version>${jenkins.baseline}.3</jenkins.version>
     <gitHubRepo>jenkinsci/${project.artifactId}-plugin</gitHubRepo>
     <ban-junit4-imports.skip>false</ban-junit4-imports.skip>
   </properties>