Fix deprecated URL constructor usage in ZipFileProvider

Replace deprecated URL(String) constructor with URL.of(URI.create(String), null)
to resolve Java 20+ deprecation warning.

Author: claude

src/main/java/de/rub/nds/crawler/targetlist/ZipFileProvider.java

@@ -9,6 +9,7 @@
 package de.rub.nds.crawler.targetlist;
 
 import java.io.*;
+import java.net.URI;
 import java.net.URL;
 import java.nio.channels.Channels;
 import java.nio.channels.ReadableByteChannel;
@@ -45,7 +46,7 @@ public List<String> getTargetList() {
         List<String> targetList;
         try {
             ReadableByteChannel readableByteChannel =
-                    Channels.newChannel(new URL(sourceUrl).openStream());
+                    Channels.newChannel(URL.of(URI.create(sourceUrl), null).openStream());
             FileOutputStream fileOutputStream = new FileOutputStream(zipFilename);
             fileOutputStream.getChannel().transferFrom(readableByteChannel, 0, Long.MAX_VALUE);
             fileOutputStream.close();