Bump serve-static and browser-sync

Bumps [serve-static](https://github.com/expressjs/serve-static) to 1.16.2 and updates ancestor dependency [browser-sync](https://github.com/BrowserSync/browser-sync). These dependencies need to be updated together.


Updates `serve-static` from 1.10.3 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@v1.10.3...v1.16.2)

Updates `browser-sync` from 2.13.0 to 3.0.4
- [Release notes](https://github.com/BrowserSync/browser-sync/releases)
- [Changelog](https://github.com/BrowserSync/browser-sync/blob/master/changelog.js)
- [Commits](BrowserSync/browser-sync@v2.13.0...v3.0.4)

---
updated-dependencies:
- dependency-name: serve-static
  dependency-version: 1.16.2
  dependency-type: indirect
- dependency-name: browser-sync
  dependency-version: 3.0.4
  dependency-type: direct:development
...

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Author: dependabot[bot]