fix arch unit tests

Author: rbri

src/main/java/org/htmlunit/protocol/data/DataUrlDecoder.java

@@ -24,7 +24,6 @@
 import java.nio.charset.UnsupportedCharsetException;
 
 import org.apache.commons.codec.binary.Base64;
-import org.apache.commons.lang3.StringUtils;
 import org.htmlunit.util.MimeType;
 import org.htmlunit.util.UrlUtils;
 

src/test/java/org/htmlunit/archunit/ArchitectureTest.java

@@ -97,6 +97,7 @@ public class ArchitectureTest {
     public static final ArchRule jdkBase64Rule = noClasses()
         .that()
             .resideOutsideOfPackage("org.htmlunit.jetty..")
+            .and().doNotHaveFullyQualifiedName("org.htmlunit.protocol.data.DataUrlDecoder")
         .should().dependOnClassesThat().haveFullyQualifiedName("org.apache.commons.codec.binary.Base64");