Bump eslint from 7.17.0 to 7.21.0 (#6)

Bumps [eslint](https://github.com/eslint/eslint) from 7.17.0 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@v7.17.0...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

@@ -37,6 +37,6 @@
   "devDependencies": {
     "@betahuhn/config": "^1.0.2",
     "@vercel/ncc": "^0.27.0",
-    "eslint": "^7.17.0"
+    "eslint": "^7.21.0"
   }
 }