Bump eslint from 7.20.0 to 7.21.0

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>

package.json

@@ -288,7 +288,7 @@
         "@types/vscode": "^1.53.0",
         "@typescript-eslint/eslint-plugin": "^4.0.0",
         "@typescript-eslint/parser": "^3.10.1",
-        "eslint": "^7.20.0",
+        "eslint": "^7.21.0",
         "eslint-config-airbnb-base": "^14.2.1",
         "eslint-plugin-import": "^2.22.1",
         "glob": "^7.1.6",