remove accidental ? devDependency

packages/@uppy/dashboard/package.json

@@ -37,9 +37,6 @@
     "preact": "8.2.9",
     "resize-observer-polyfill": "^1.5.0"
   },
-  "devDependencies": {
-    "@uppy/google-drive": "file:../google-drive"
-  },
   "peerDependencies": {
     "@uppy/core": "^1.0.0"
   }