Modernize to latest versions supported by Java 8 (#34)

* refactor: Modernize to latest versions supported by Java 8

Use this link to re-run the recipe: https://app.moderne.io/recipes/org.openrewrite.jenkins.ModernizePluginForJava8?organizationId=SmVua2lucyBDSQ%3D%3D

Co-authored-by: Moderne <[email protected]>

* Raise access modifier of readResolve to protected

Unforking XStream required the access level of this method to be
protected. Fortunately this means the super method can be called
directly instead of using reflection.

jenkinsci/jenkins#4944

---------

Co-authored-by: Moderne <[email protected]>
Co-authored-by: Steve Hill <[email protected]>

pom.xml

@@ -4,13 +4,12 @@
 	<parent>
 		<groupId>org.jenkins-ci.plugins</groupId>
 		<artifactId>plugin</artifactId>
-		<version>4.7</version>
+		<version>4.51</version>
 		<relativePath />
 	</parent>
 
 	<properties>
-		<jenkins.version>2.249.1</jenkins.version>
-		<java.level>8</java.level>
+		<jenkins.version>2.346.3</jenkins.version>
 	</properties>
 
 	<artifactId>categorized-view</artifactId>

src/main/java/org/jenkinsci/plugins/categorizedview/CategorizedJobsView.java

@@ -2,7 +2,6 @@
 
 import java.io.IOException;
 import java.lang.reflect.Field;
-import java.lang.reflect.Method;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.TreeSet;
@@ -47,14 +46,8 @@ public CategorizedJobsView(final String name, final ViewGroup owner) {
 		super(name, owner);
 	}
 
-	private Object readResolve() {
-		try {
-			Method readResolve = ListView.class.getDeclaredMethod("readResolve");
-			readResolve.setAccessible(true);
-			readResolve.invoke(this);
-		} catch (Exception e) {
-			e.printStackTrace();
-		}
+	protected Object readResolve() {
+		super.readResolve();
 		try {
 			Field field = ListView.class.getDeclaredField("jobNames");
 			field.setAccessible(true);