Bump selenium-webdriver from 4.20.0 to 4.21.0

Bumps [selenium-webdriver](https://github.com/SeleniumHQ/selenium) from 4.20.0 to 4.21.0.
- [Release notes](https://github.com/SeleniumHQ/selenium/releases)
- [Commits](SeleniumHQ/selenium@selenium-4.20.0...selenium-4.21.0)

---
updated-dependencies:
- dependency-name: selenium-webdriver
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>