chore: Move to fork of y-prosemirror, new fixes and exposing updateYFragment method

server/commands/documentUpdater.ts

@@ -1,7 +1,7 @@
+import { yDocToProsemirrorJSON } from "@getoutline/y-prosemirror";
 import invariant from "invariant";
 import { uniq } from "lodash";
 import { Node } from "prosemirror-model";
-import { yDocToProsemirrorJSON } from "y-prosemirror";
 import * as Y from "yjs";
 import { schema, serializer } from "@server/editor";
 import { Document, Event } from "@server/models";