Merge pull request #373 from line/renovate/form-data-4.x

Update dependency form-data to v4

Author: tokuhirom

package-lock.json

@@ -41,7 +41,7 @@
     "axios": "^0.27.0",
     "body-parser": "^1.20.0",
     "file-type": "^16.5.4",
-    "form-data": "^3.0.0"
+    "form-data": "^4.0.0"
   },
   "devDependencies": {
     "@types/express": "4.17.13",