Upgrade plugin parent POM to latest (#64)

pom.xml

@@ -4,7 +4,7 @@
   <parent>
     <groupId>org.jenkins-ci.plugins</groupId>
     <artifactId>plugin</artifactId>
-    <version>4.88</version>
+    <version>5.1</version>
     <relativePath />
   </parent>
 
@@ -65,11 +65,8 @@
   <properties>
     <revision>1.19</revision>
     <changelist>-SNAPSHOT</changelist>
-    <jenkins.version>2.472</jenkins.version>
+    <jenkins.version>2.479</jenkins.version>
     <gitHubRepo>jenkinsci/${project.artifactId}-plugin</gitHubRepo>
-    <!-- TODO JENKINS-73339 until in parent POM -->
-    <jenkins-test-harness.version>2250.v03a_1295b_0a_30</jenkins-test-harness.version>
-    <maven.compiler.release>17</maven.compiler.release>
     <spotless.check.skip>false</spotless.check.skip>
   </properties>
 

src/test/java/com/tikal/hudson/plugins/notification/ProtocolTest.java

@@ -26,6 +26,11 @@
 import com.google.common.base.MoreObjects;
 import com.google.common.base.Objects;
 import com.google.common.io.CharStreams;
+import jakarta.servlet.Servlet;
+import jakarta.servlet.ServletException;
+import jakarta.servlet.http.HttpServlet;
+import jakarta.servlet.http.HttpServletRequest;
+import jakarta.servlet.http.HttpServletResponse;
 import java.io.IOException;
 import java.net.MalformedURLException;
 import java.net.URL;
@@ -34,14 +39,9 @@
 import java.util.List;
 import java.util.concurrent.BlockingQueue;
 import java.util.concurrent.LinkedBlockingQueue;
-import javax.servlet.Servlet;
-import javax.servlet.ServletException;
-import javax.servlet.http.HttpServlet;
-import javax.servlet.http.HttpServletRequest;
-import javax.servlet.http.HttpServletResponse;
 import junit.framework.TestCase;
-import org.eclipse.jetty.ee8.servlet.ServletContextHandler;
-import org.eclipse.jetty.ee8.servlet.ServletHolder;
+import org.eclipse.jetty.ee9.servlet.ServletContextHandler;
+import org.eclipse.jetty.ee9.servlet.ServletHolder;
 import org.eclipse.jetty.server.Connector;
 import org.eclipse.jetty.server.Server;
 import org.eclipse.jetty.server.ServerConnector;