Remove useWorkspaces from lerna

lerna.json

@@ -5,9 +5,8 @@
     "access": "public"
   },
   "npmClient": "yarn",
-  "useWorkspaces": true,
   "packages": [
     "packages/core",
     "packages/tldraw"
   ]
-}
+}

packages/core/package.json

@@ -48,5 +48,5 @@
     "react-error-boundary": "^3.1.3",
     "react-use-gesture": "^9.1.3"
   },
-  "gitHead": "924553373cb0612829428e51513a2a76e2e0c348"
+  "gitHead": "a7dac0f83ad998e205c2aab58182cb4ba4e099a6"
 }

packages/dev/package.json

@@ -33,5 +33,5 @@
     "rimraf": "3.0.2",
     "typescript": "4.2.3"
   },
-  "gitHead": "924553373cb0612829428e51513a2a76e2e0c348"
+  "gitHead": "a7dac0f83ad998e205c2aab58182cb4ba4e099a6"
 }