Bump eslint from 7.20.0 to 7.21.0 (#209)

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] <[email protected]>

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

Author: dependabot[bot]

package-lock.json

@@ -36,7 +36,7 @@
   },
   "devDependencies": {
     "babel-eslint": "^10.1.0",
-    "eslint": "^7.20.0",
+    "eslint": "^7.21.0",
     "eslint-config-tc": "^17.0.0",
     "eslint-formatter-pretty": "^4.0.0",
     "eslint-plugin-eslint-comments": "^3.2.0",