Bump fsevents from 1.1.2 to 1.2.13 in /demo

Bumps [fsevents](https://github.com/fsevents/fsevents) from 1.1.2 to 1.2.13.
- [Release notes](https://github.com/fsevents/fsevents/releases)
- [Commits](fsevents/fsevents@v1.1.2...v1.2.13)

---
updated-dependencies:
- dependency-name: fsevents
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <[email protected]>