Bump send and serve-static (#626)

Bumps [send](https://github.com/pillarjs/send) and [serve-static](https://github.com/expressjs/serve-static). These dependencies needed to be updated together.

Updates `send` from 0.17.1 to 0.19.0
- [Release notes](https://github.com/pillarjs/send/releases)
- [Changelog](https://github.com/pillarjs/send/blob/master/HISTORY.md)
- [Commits](pillarjs/send@0.17.1...0.19.0)

Updates `serve-static` from 1.14.1 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@v1.14.1...v1.16.2)

---
updated-dependencies:
- dependency-name: send
  dependency-type: indirect
- dependency-name: serve-static
  dependency-type: indirect
...

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Author: dependabot[bot]