Bump org.htmlunit:htmlunit

Bumps [org.htmlunit:htmlunit](https://github.com/HtmlUnit/htmlunit) from 3.8.0 to 3.9.0.
- [Release notes](https://github.com/HtmlUnit/htmlunit/releases)
- [Commits](HtmlUnit/htmlunit@3.8.0...3.9.0)

---
updated-dependencies:
- dependency-name: org.htmlunit:htmlunit
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <support@github.com>

maven-failsafe-plugin/src/it/jetty-war-test-failing/pom.xml

@@ -42,7 +42,7 @@
     <dependency>
       <groupId>org.htmlunit</groupId>
       <artifactId>htmlunit</artifactId>
-      <version>3.8.0</version>
+      <version>3.9.0</version>
       <scope>test</scope>
     </dependency>
   </dependencies>