chore(deps): update dependency eslint to v7.31.0

Author: renovate-bot

site/package.json

@@ -46,7 +46,7 @@
   },
   "devDependencies": {
     "@wpackio/eslint-config": "file:../packages/eslint-config",
-    "eslint": "7.25.0",
+    "eslint": "7.31.0",
     "gatsby-plugin-sharp": "2.9.0",
     "gatsby-transformer-sharp": "2.7.0",
     "prettier": "2.2.1"