chore(deps): update dependency eslint to v7.21.0

Author: renovate-bot

package-lock.json

@@ -30,7 +30,7 @@
     "@types/node": "14.14.31",
     "@typescript-eslint/eslint-plugin": "4.15.2",
     "@typescript-eslint/parser": "4.15.2",
-    "eslint": "7.20.0",
+    "eslint": "7.21.0",
     "eslint-config-prettier": "8.1.0",
     "eslint-plugin-import": "2.22.1",
     "husky": "5.1.1",