chore(deps): bump node-fetch and prop-types (#20)

Removes [node-fetch](https://github.com/node-fetch/node-fetch). It's no longer used after updating ancestor dependency [prop-types](https://github.com/facebook/prop-types). These dependencies need to be updated together.


Removes `node-fetch`

Updates `prop-types` from 15.6.0 to 15.8.1
- [Release notes](https://github.com/facebook/prop-types/releases)
- [Changelog](https://github.com/facebook/prop-types/blob/main/CHANGELOG.md)
- [Commits](facebook/prop-types@v15.6.0...v15.8.1)

---
updated-dependencies:
- dependency-name: node-fetch
  dependency-type: indirect
- dependency-name: prop-types
  dependency-type: indirect
...

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Author: dependabot[bot]