[MNG-6847] Use diamond operator (#161)

As discussed on
- apache/maven-scm#184
- https://issues.apache.org/jira/browse/MNG-6847

Review requested of @elharo

Use this link to re-run the recipe: https://app.moderne.io/recipes/org.openrewrite.staticanalysis.UseDiamondOperator?organizationId=QXBhY2hlIE1hdmVu

Co-authored-by: Moderne <team@moderne.io>

src/main/java/org/apache/maven/plugins/site/render/ReportDocumentRenderer.java

@@ -111,7 +111,7 @@ private static class MultiPageSinkFactory implements SinkFactory {
         /**
          * List of sinks (subpages) associated to this report
          */
-        private List<MultiPageSubSink> sinks = new ArrayList<MultiPageSubSink>();
+        private List<MultiPageSubSink> sinks = new ArrayList<>();
 
         MultiPageSinkFactory(MavenReport report, DocumentRenderingContext docRenderingContext) {
             this.report = report;

src/test/java/org/apache/maven/plugins/site/deploy/AbstractSiteDeployWebDavTest.java

@@ -152,7 +152,7 @@ public void davDeployThruProxyWitAuthzInProxy() throws Exception {
         FileUtils.cleanDirectory(siteTargetPath);
         // SimpleDavServerHandler simpleDavServerHandler = new SimpleDavServerHandler( siteTargetPath );
 
-        Map<String, String> authentications = new HashMap<String, String>();
+        Map<String, String> authentications = new HashMap<>();
         authentications.put("foo", "titi");
 
         AuthAsyncProxyServlet servlet = new AuthAsyncProxyServlet(authentications, siteTargetPath);

src/test/java/org/apache/maven/plugins/site/deploy/AuthAsyncProxyServlet.java

@@ -44,7 +44,7 @@ public class AuthAsyncProxyServlet extends AsyncProxyServlet {
 
     private Logger log = LoggerFactory.getLogger(getClass());
 
-    List<HttpRequest> httpRequests = new ArrayList<HttpRequest>();
+    List<HttpRequest> httpRequests = new ArrayList<>();
 
     private File siteTargetPath;
 

src/test/java/org/apache/maven/plugins/site/deploy/HttpRequest.java

@@ -22,7 +22,7 @@
 import java.util.Map;
 
 class HttpRequest {
-    Map<String, String> headers = new HashMap<String, String>();
+    Map<String, String> headers = new HashMap<>();
 
     String method;
 

src/test/java/org/apache/maven/plugins/site/deploy/SimpleDavServerHandler.java

@@ -53,7 +53,7 @@ public class SimpleDavServerHandler {
 
     private File siteTargetPath;
 
-    List<HttpRequest> httpRequests = new ArrayList<HttpRequest>();
+    List<HttpRequest> httpRequests = new ArrayList<>();
 
     public SimpleDavServerHandler(final File targetPath) throws Exception {
         this.siteTargetPath = targetPath;