Bump node-fetch and react-admin (#191)

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


Removes `node-fetch`

Updates `react-admin` from 2.1.1 to 4.7.2
- [Release notes](https://github.com/marmelab/react-admin/releases)
- [Changelog](https://github.com/marmelab/react-admin/blob/master/CHANGELOG.md)
- [Upgrade guide](https://github.com/marmelab/react-admin/blob/master/docs/Upgrade.md)
- [Commits](marmelab/react-admin@v2.1.1...v4.7.2)

---
updated-dependencies:
- dependency-name: node-fetch
  dependency-type: indirect
- dependency-name: react-admin
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]