Bump eslint from 7.16.0 to 7.21.0

Bumps [eslint](https://github.com/eslint/eslint) from 7.16.0 to 7.21.0.
- [Release notes](https://github.com/eslint/eslint/releases)
- [Changelog](https://github.com/eslint/eslint/blob/master/CHANGELOG.md)
- [Commits](eslint/eslint@v7.16.0...v7.21.0)

Signed-off-by: dependabot[bot] <support@github.com>

package.json

@@ -33,7 +33,7 @@
     "enzyme": "^3.11.0",
     "enzyme-adapter-react-16": "^1.15.5",
     "enzyme-to-json": "^3.6.1",
-    "eslint": "^7.16.0",
+    "eslint": "^7.21.0",
     "eslint-config-airbnb": "^18.2.1",
     "eslint-config-prettier": "^8.1.0",
     "eslint-import-resolver-alias": "^1.1.2",