Bump selenium from 4.20.0 to 4.24.0 in /tools

Bumps [selenium](https://github.com/SeleniumHQ/Selenium) from 4.20.0 to 4.24.0.
- [Release notes](https://github.com/SeleniumHQ/Selenium/releases)
- [Commits](SeleniumHQ/selenium@selenium-4.20.0...selenium-4.24.0)

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

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

Author: dependabot[bot]

tools/wptrunner/requirements_opera.txt

@@ -1,2 +1,2 @@
 mozprocess==1.3.1
-selenium==4.20.0
+selenium==4.24.0

tools/wptrunner/requirements_sauce.txt

@@ -1,2 +1,2 @@
-selenium==4.20.0
+selenium==4.24.0
 requests==2.32.3