chore(deps-dev): bump eslint from 7.20.0 to 7.21.0 (#570)

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>

Author: dependabot[bot]

package.json

@@ -58,7 +58,7 @@
     "docz": "2.3.1",
     "docz-theme-default": "1.2.0",
     "docz-utils": "2.3.0",
-    "eslint": "7.20.0",
+    "eslint": "7.21.0",
     "kcd-scripts": "7.7.0",
     "prettier": "^2.2.1",
     "react": "17.0.1",