Tweak test timing to improve robustness (#1274)

See eg
https://github.com/cursorless-dev/cursorless/actions/runs/4185105474/jobs/7251680386

## Checklist

- [ ] I have added
[tests](https://www.cursorless.org/docs/contributing/test-case-recorder/)
- [ ] I have updated the
[docs](https://github.com/cursorless-dev/cursorless/tree/main/docs) and
[cheatsheet](https://github.com/cursorless-dev/cursorless/tree/main/cursorless-talon/src/cheatsheet)
- [ ] I have not broken the cheatsheet

Author: pokey

src/apps/cursorless-vscode-e2e/suite/editNewCell.test.ts

@@ -33,7 +33,7 @@ async function runTest(
 
   // FIXME: There seems to be some timing issue when you create a notebook
   // editor
-  await sleepWithBackoff(100);
+  await sleepWithBackoff(200);
 
   await graph.hatTokenMap.allocateHats();