Bump send, browser-sync and express

Bumps [send](https://github.com/pillarjs/send) to 0.19.1 and updates ancestor dependencies [send](https://github.com/pillarjs/send), [browser-sync](https://github.com/BrowserSync/browser-sync) and [express](https://github.com/expressjs/express). These dependencies need to be updated together.


Updates `send` from 0.18.0 to 0.19.1
- [Release notes](https://github.com/pillarjs/send/releases)
- [Changelog](https://github.com/pillarjs/send/blob/master/HISTORY.md)
- [Commits](https://github.com/pillarjs/send/commits)

Updates `browser-sync` from 2.29.3 to 3.0.3
- [Release notes](https://github.com/BrowserSync/browser-sync/releases)
- [Changelog](https://github.com/BrowserSync/browser-sync/blob/master/changelog.js)
- [Commits](BrowserSync/browser-sync@v2.29.3...v3.0.3)

Updates `express` from 4.18.2 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@4.18.2...4.21.1)

---
updated-dependencies:
- dependency-name: send
  dependency-type: indirect
- dependency-name: browser-sync
  dependency-type: direct:development
- dependency-name: express
  dependency-type: indirect
...

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