fix(deps): update dependency form-data to v4

Author: renovate[bot]

functions/package-lock.json

@@ -20,7 +20,7 @@
     "express": "^4.19.2",
     "firebase-admin": "^11.11.1",
     "firebase-functions": "^4.8.2",
-    "form-data": "^3.0.1",
+    "form-data": "^4.0.0",
     "js2xmlparser": "^4.0.2",
     "querystring": "^0.2.1"
   },