Fix resource leaks in ZipFileProvider

- Use try-with-resources to ensure ReadableByteChannel and FileOutputStream are properly closed
- Use nested try-with-resources for FileOutputStream in unzipping section
- Prevents potential resource leaks that could lead to file handle exhaustion

Author: TLS-Attacker Developer

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

@@ -43,12 +43,10 @@ protected ZipFileProvider(
 
     public List<String> getTargetList() {
         List<String> targetList;
-        try {
-            ReadableByteChannel readableByteChannel =
-                    Channels.newChannel(new URL(sourceUrl).openStream());
-            FileOutputStream fileOutputStream = new FileOutputStream(zipFilename);
+        try (ReadableByteChannel readableByteChannel =
+                        Channels.newChannel(new URL(sourceUrl).openStream());
+                FileOutputStream fileOutputStream = new FileOutputStream(zipFilename)) {
             fileOutputStream.getChannel().transferFrom(readableByteChannel, 0, Long.MAX_VALUE);
-            fileOutputStream.close();
         } catch (IOException e) {
             LOGGER.error("Could not download the current {} list with error ", listName, e);
         }
@@ -59,13 +57,13 @@ public List<String> getTargetList() {
             }
             File newFile = new File(outputFile);
             // write file content
-            FileOutputStream fos = new FileOutputStream(newFile);
-            int len;
-            byte[] buffer = new byte[1024];
-            while ((len = zis.read(buffer)) > 0) {
-                fos.write(buffer, 0, len);
+            try (FileOutputStream fos = new FileOutputStream(newFile)) {
+                int len;
+                byte[] buffer = new byte[1024];
+                while ((len = zis.read(buffer)) > 0) {
+                    fos.write(buffer, 0, len);
+                }
             }
-            fos.close();
         } catch (IOException e) {
             LOGGER.error("Could not unzip the current {} list with error ", listName, e);
         }