Upgrade HtmlUnit from 2.x to 3.x

[timja-bot]

This is an autogenerated PR for updating HtmlUnit

It follows the migration guide

Migration steps for cases the script can't handle

This migration currently can't handle HtmlOption changes properly.
If it fails to compile on HtmlOption then revert the specific case:

--- a/src/test/java/hudson/plugins/emailext/ExtendedEmailPublisherDescriptorTest.java
+++ b/src/test/java/hudson/plugins/emailext/ExtendedEmailPublisherDescriptorTest.java
@@ -114,7 +114,7 @@ public class ExtendedEmailPublisherDescriptorTest {
      assertEquals(
              "Plain text should be selected by default",
              "text/plain",
-                contentType.getSelectedOptions().get(0).getValue());
+                contentType.getSelectedOptions().get(0).getValueAttribute());

Ping @timja if any questions

script source

[daniel-beck]

Is this another thing that's blocking someone else but nobody bothers to say so, or can I do this whenever is convenient?

[MarkEWaite]

Is this another thing that's blocking someone else but nobody bothers to say so, or can I do this whenever is convenient?

I'm not aware of this change being a blocker for anyone else. The blocking changes that were detected by the plugin bill of materials were all included in plugin BOM 2193 that released two weeks ago. Based on the list of plugins that depend on this plugin, I don't see anything that hints it is a blocker for any other work.