Bump path-to-regexp and express in /react-rust-postgres/frontend

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

Updates `path-to-regexp` from 0.1.7 to 0.1.12
- [Release notes](https://github.com/pillarjs/path-to-regexp/releases)
- [Changelog](https://github.com/pillarjs/path-to-regexp/blob/master/History.md)
- [Commits](https://github.com/pillarjs/path-to-regexp/compare/v0.1.7...v0.1.12)

Updates `express` from 4.17.3 to 4.21.2
- [Release notes](https://github.com/expressjs/express/releases)
- [Changelog](https://github.com/expressjs/express/blob/4.21.2/History.md)
- [Commits](https://github.com/expressjs/express/compare/4.17.3...4.21.2)

---
updated-dependencies:
- dependency-name: path-to-regexp
  dependency-version: 0.1.12
  dependency-type: indirect
- dependency-name: express
  dependency-version: 4.21.2
  dependency-type: indirect
...

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