Bump org.seleniumhq.selenium:selenium-java in /testing

Bumps [org.seleniumhq.selenium:selenium-java](https://github.com/SeleniumHQ/selenium) from 4.38.0 to 4.39.0.
- [Release notes](https://github.com/SeleniumHQ/selenium/releases)
- [Commits](SeleniumHQ/selenium@selenium-4.38.0...selenium-4.39.0)

---
updated-dependencies:
- dependency-name: org.seleniumhq.selenium:selenium-java
  dependency-version: 4.39.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

testing/pom.xml

@@ -33,7 +33,7 @@
         <dependency>
             <groupId>org.seleniumhq.selenium</groupId>
             <artifactId>selenium-java</artifactId>
-            <version>4.38.0</version>
+            <version>4.39.0</version>
         </dependency>
         <dependency>
             <groupId>org.slf4j</groupId>