Bump eslint-plugin-prettier from 3.4.1 to 4.2.1 (#310)

Bumps [eslint-plugin-prettier](https://github.com/prettier/eslint-plugin-prettier) from 3.4.1 to 4.2.1.
- [Release notes](https://github.com/prettier/eslint-plugin-prettier/releases)
- [Changelog](https://github.com/prettier/eslint-plugin-prettier/blob/master/CHANGELOG.md)
- [Commits](https://github.com/prettier/eslint-plugin-prettier/commits/v4.2.1)

---
updated-dependencies:
- dependency-name: eslint-plugin-prettier
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

package.json

@@ -16,7 +16,7 @@
     "eslint": "^7.25.0",
     "eslint-config-prettier": "^8.3.0",
     "eslint-config-react-app": "^7.0.1",
-    "eslint-plugin-prettier": "^3.1.2",
+    "eslint-plugin-prettier": "^4.2.1",
     "jest-fetch-mock": "^3.0.3",
     "prettier": "^2.2.0",
     "ra-test": "^3.15.0"