Bump body-parser and express in /react-express-mongodb/frontend

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

Updates `body-parser` from 1.19.2 to 1.20.3
- [Release notes](https://github.com/expressjs/body-parser/releases)
- [Changelog](https://github.com/expressjs/body-parser/blob/master/HISTORY.md)
- [Commits](https://github.com/expressjs/body-parser/compare/1.19.2...1.20.3)

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: body-parser
  dependency-version: 1.20.3
  dependency-type: indirect
- dependency-name: express
  dependency-version: 4.21.2
  dependency-type: indirect
...

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