Bump org.htmlunit:htmlunit from 3.8.0 to 3.9.0 (#695)

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
...

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pom.xml

@@ -215,7 +215,7 @@
       <dependency>
         <groupId>org.htmlunit</groupId>
         <artifactId>htmlunit</artifactId>
-        <version>3.8.0</version>
+        <version>3.9.0</version>
       </dependency>
       <dependency>
         <!-- used in the unit tests and maven-shared-utils:3.3.4 -->