[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

Author: pre-commit-ci[bot]

packages/schema/src/doc.ts

@@ -1,5 +1,5 @@
 import { MapChange, YDocument } from '@jupyter/ydoc';
-import { JSONExt, JSONObject} from '@lumino/coreutils';
+import { JSONExt, JSONObject } from '@lumino/coreutils';
 import { ISignal, Signal } from '@lumino/signaling';
 import * as Y from 'yjs';