chore(deps): bump serve-static, express and @zendeskgarden/scripts

Bumps [serve-static](https://github.com/expressjs/serve-static) to 1.16.2 and updates ancestor dependencies [serve-static](https://github.com/expressjs/serve-static), [express](https://github.com/expressjs/express) and [@zendeskgarden/scripts](https://github.com/zendeskgarden/scripts). These dependencies need to be updated together.


Updates `serve-static` from 1.15.0 to 1.16.2
- [Release notes](https://github.com/expressjs/serve-static/releases)
- [Changelog](https://github.com/expressjs/serve-static/blob/v1.16.2/HISTORY.md)
- [Commits](expressjs/serve-static@v1.15.0...v1.16.2)

Updates `express` from 4.19.2 to 4.21.1
- [Release notes](https://github.com/expressjs/express/releases)
- [Changelog](https://github.com/expressjs/express/blob/4.21.1/History.md)
- [Commits](expressjs/express@4.19.2...4.21.1)

Updates `@zendeskgarden/scripts` from 2.4.2 to 2.4.3
- [Changelog](https://github.com/zendeskgarden/scripts/blob/main/CHANGELOG.md)
- [Commits](zendeskgarden/scripts@v2.4.2...v2.4.3)

---
updated-dependencies:
- dependency-name: serve-static
  dependency-type: indirect
- dependency-name: express
  dependency-type: indirect
- dependency-name: "@zendeskgarden/scripts"
  dependency-type: direct:development
...

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

Author: dependabot[bot]