Migrate plugins to Java 25 LTS

Author: jonesbusy

Jenkinsfile

@@ -3,8 +3,10 @@
  https://github.com/jenkins-infra/pipeline-library/
 */
 buildPlugin(
-  useContainerAgent: true, // Set to `false` if you need to use Docker for containerized tests
+  useContainerAgent: true,
+  forkCount: '1C', // Set to `false` if you need to use Docker for containerized tests
   configurations: [
     [platform: 'linux', jdk: 21],
     [platform: 'windows', jdk: 17],
+    [platform: 'linux', jdk: 25],
 ])

pom.xml

@@ -4,7 +4,7 @@
   <parent>
     <groupId>org.jenkins-ci.plugins</groupId>
     <artifactId>plugin</artifactId>
-    <version>5.18</version>
+    <version>5.19</version>
     <relativePath />
   </parent>
   <groupId>io.jenkins.plugins</groupId>