Test with Java 21 (#146)

Author: gounthar

Jenkinsfile

@@ -1,6 +1,6 @@
 buildPlugin(
   useContainerAgent: false,
   configurations: [
-    [platform: 'linux', jdk: 17],
-    [platform: 'windows', jdk: 11],
+    [platform: 'linux', jdk: 21],
+    [platform: 'windows', jdk: 17],
 ])

pom.xml

@@ -5,7 +5,7 @@
   <parent>
     <groupId>org.jenkins-ci.plugins</groupId>
     <artifactId>plugin</artifactId>
-    <version>4.70</version>
+    <version>4.76</version>
     <relativePath/>
   </parent>
 
@@ -155,7 +155,7 @@
       <dependency>
         <groupId>io.jenkins.tools.bom</groupId>
         <artifactId>bom-2.387.x</artifactId>
-        <version>2230.v0cb_4040cde55</version>
+        <version>2543.vfb_1a_5fb_9496d</version>
         <scope>import</scope>
         <type>pom</type>
       </dependency>