Update dependency mysql2 to v3.9.4 [SECURITY]

Author: renovate[bot]

n8n/package-lock.json

@@ -45,15 +45,15 @@
     "@typescript-eslint/parser": "^5.36",
     "eslint-plugin-n8n-nodes-base": "^1.11.0",
     "gulp": "^4.0.2",
-    "mysql2": "~2.3.0",
+    "mysql2": "~3.9.0",
     "n8n-core": "*",
     "n8n-workflow": "*",
     "prettier": "^2.7.1",
     "tslint": "^6.1.2",
     "typescript": "~4.8.4"
   },
   "dependencies": {
-    "mysql2": "~2.3.0",
+    "mysql2": "~3.9.0",
     "urllib": "~2.40.0"
   }
 }