chore(pom): Use recommended core version 2.504.3, and Java 11

Author: jonesbusy

pom.xml

@@ -5,7 +5,7 @@
   <parent>
     <groupId>org.jenkins-ci.plugins</groupId>
     <artifactId>plugin</artifactId>
-    <version>5.27</version>
+    <version>5.28</version>
     <relativePath />
   </parent>
 
@@ -34,7 +34,7 @@
     <changelist>999999-SNAPSHOT</changelist>
     <gitHubRepo>jenkinsci/skip-notifications-trait-plugin</gitHubRepo>
     <!-- https://www.jenkins.io/doc/developer/plugin-development/choosing-jenkins-baseline/ -->
-    <jenkins.baseline>2.492</jenkins.baseline>
+    <jenkins.baseline>2.504</jenkins.baseline>
     <jenkins.version>${jenkins.baseline}.3</jenkins.version>
     <spotless.check.skip>false</spotless.check.skip>
     <ban-junit4-imports.skip>false</ban-junit4-imports.skip>
@@ -45,7 +45,7 @@
       <dependency>
         <groupId>io.jenkins.tools.bom</groupId>
         <artifactId>bom-${jenkins.baseline}.x</artifactId>
-        <version>5473.vb_9533d9e5d88</version>
+        <version>5601.v59f37270a_349</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>