chore(deps-dev): bump eslint from 7.20.0 to 7.21.0 (#268)

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](eslint/eslint@v7.20.0...v7.21.0)

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

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

package.json

@@ -44,7 +44,7 @@
     "@semantic-release/git": "^9.0.0",
     "codecov": "^3.8.1",
     "conventional-changelog": "^3.1.24",
-    "eslint": "^7.20.0",
+    "eslint": "^7.21.0",
     "eslint-config-airbnb": "^18.2.1",
     "eslint-plugin-import": "^2.22.1",
     "eslint-plugin-jsx-a11y": "^6.4.1",