Upgrade HtmlUnit from 2.x to 3.x

Author: timja

pom.xml

@@ -3,7 +3,7 @@
   <parent>
     <groupId>org.jenkins-ci.plugins</groupId>
     <artifactId>plugin</artifactId>
-    <version>4.53</version>
+    <version>4.66</version>
   </parent>
 
   <artifactId>powershell</artifactId>

src/test/java/hudson/plugins/powershell/PowerShellTest.java

@@ -6,8 +6,8 @@
 import java.util.regex.Pattern;
 import java.util.stream.Stream;
 
-import com.gargoylesoftware.htmlunit.html.HtmlForm;
-import com.gargoylesoftware.htmlunit.html.HtmlPage;
+import org.htmlunit.html.HtmlForm;
+import org.htmlunit.html.HtmlPage;
 import hudson.model.FreeStyleBuild;
 import hudson.model.FreeStyleProject;
 import hudson.model.Result;