Synchronise all plugins on Java 17

Minimum required GoCD version moves to 22.1.0.

Author: chadlwilson

build.gradle

@@ -20,8 +20,8 @@ apply from: "https://raw.githubusercontent.com/gocd/gocd-plugin-gradle-task-help
 
 gocdPlugin {
   id = 'cd.go.contrib.elasticagent.kubernetes'
-  pluginVersion = '4.1.1'
-  goCdVersion = '21.4.0'
+  pluginVersion = '5.0.0'
+  goCdVersion = '22.1.0'
   name = 'Kubernetes Elastic Agent Plugin'
   description = 'Kubernetes Based Elastic Agent Plugins for GoCD'
   vendorName = 'Thoughtworks, Inc.'
@@ -47,8 +47,13 @@ repositories {
     mavenLocal()
 }
 
+java {
+    sourceCompatibility = JavaVersion.VERSION_17
+    targetCompatibility = JavaVersion.VERSION_17
+}
+
 tasks.withType(JavaCompile).configureEach {
-    options.release = 11
+    options.release = 17
 }
 
 ext {