Bump eslint from 7.20.0 to 7.21.0 (#15810)

Bumps [eslint](https://github.com/eslint/eslint) from 7.20.0 to 7.21.0.
- [Release notes](https://github.com/eslint/eslint/releases)
- [Changelog](https://github.com/eslint/eslint/blob/master/CHANGELOG.md)
- [Commits](https://github.com/eslint/eslint/compare/v7.20.0...v7.21.0)

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

package.json

@@ -175,7 +175,7 @@
     "@testing-library/react": "^11.2.5",
     "babel-eslint": "^10.1.0",
     "babel-jest": "^26.6.3",
-    "eslint": "^7.20.0",
+    "eslint": "^7.21.0",
     "eslint-plugin-import": "~2.22.1",
     "eslint-plugin-jsx-a11y": "~6.4.1",
     "eslint-plugin-promise": "~4.3.1",