Reorder imports in UrlIncludeResolver

Adjust import ordering in UrlIncludeResolver.java to place Inet6Address before InetAddress. This is a non-functional formatting change to satisfy import ordering/style; no behavior changes made.

Author: jcputney

mjml-java-resolvers/src/main/java/dev/jcputney/mjml/resolver/UrlIncludeResolver.java

@@ -6,8 +6,8 @@
 import java.io.ByteArrayOutputStream;
 import java.io.IOException;
 import java.io.InputStream;
-import java.net.InetAddress;
 import java.net.Inet6Address;
+import java.net.InetAddress;
 import java.net.URI;
 import java.net.URISyntaxException;
 import java.net.UnknownHostException;