Bump @types/selenium-webdriver from 4.0.15 to 4.0.16 in /glean

Bumps [@types/selenium-webdriver](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/selenium-webdriver) from 4.0.15 to 4.0.16.
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/selenium-webdriver)

---
updated-dependencies:
- dependency-name: "@types/selenium-webdriver"
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]