Bump path-to-regexp and serve-handler (#49)

Bumps [path-to-regexp](https://github.com/pillarjs/path-to-regexp) and [serve-handler](https://github.com/vercel/serve-handler). These dependencies needed to be updated together.

Updates `path-to-regexp` from 2.2.1 to 3.3.0
- [Release notes](https://github.com/pillarjs/path-to-regexp/releases)
- [Changelog](https://github.com/pillarjs/path-to-regexp/blob/master/History.md)
- [Commits](pillarjs/path-to-regexp@v2.2.1...v3.3.0)

Updates `serve-handler` from 6.1.5 to 6.1.6
- [Release notes](https://github.com/vercel/serve-handler/releases)
- [Commits](vercel/serve-handler@6.1.5...6.1.6)

---
updated-dependencies:
- dependency-name: path-to-regexp
  dependency-type: indirect
- dependency-name: serve-handler
  dependency-type: indirect
...

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