Test with Java 25 (#86)

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: MarkEWaite

Jenkinsfile

@@ -1,4 +1,4 @@
 buildPlugin(useContainerAgent: true, configurations: [
-                [platform: 'linux', jdk: 21],
-                [platform: 'windows', jdk: 17],
+                [platform: 'linux', jdk: 25],
+                [platform: 'windows', jdk: 21],
             ])

pom.xml

@@ -5,7 +5,7 @@
   <parent>
     <groupId>org.jenkins-ci.plugins</groupId>
     <artifactId>plugin</artifactId>
-    <version>5.5</version>
+    <version>5.28</version>
     <relativePath />
   </parent>