deps: update dependency eslint to v7.28.0 (#669)

Author: renovate[bot]

package-lock.json

@@ -58,7 +58,7 @@
     "chokidar": "3.5.1",
     "codecov": "3.8.2",
     "docsify-cli": "4.4.3",
-    "eslint": "7.27.0",
+    "eslint": "7.28.0",
     "eslint-config-prettier": "8.3.0",
     "eslint-plugin-prettier": "3.4.0",
     "jest": "27.0.3",