Update selenium requirement from ~=4.31.0 to ~=4.39.0

Updates the requirements on [selenium](https://github.com/SeleniumHQ/Selenium) to permit the latest version.
- [Release notes](https://github.com/SeleniumHQ/Selenium/releases)
- [Commits](https://github.com/SeleniumHQ/Selenium/compare/selenium-4.31.0...selenium-4.39.0)

---
updated-dependencies:
- dependency-name: selenium
  dependency-version: 4.39.0
  dependency-type: direct:production
...

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

requirements.txt

@@ -78,7 +78,7 @@ elementpath==5.0.4
 # - Pixelmatch is used as fallback when OpenCV is unavailable
 # - To install manually: pip install opencv-python-headless>=4.8.0.76
 
-selenium~=4.31.0
+selenium~=4.39.0
 
 # Templating, so far just in the URLs but in the future can be for the notifications also
 jinja2~=3.1