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] <[email protected]>

Author: dependabot[bot]

package-lock.json

@@ -122,7 +122,7 @@
     "@types/vscode": "^1.53.0",
     "@typescript-eslint/parser": "^4.15.2",
     "@typescript-eslint/eslint-plugin": "^4.15.2",
-    "eslint": "^7.20.0",
+    "eslint": "^7.21.0",
     "glob": "^7.1.6",
     "mocha": "^8.3.0",
     "ts-loader": "^8.0.17",