[GUI] Upgrade fsevents package

**Environment**
- How did you install GRR? source
- What GRR version are you running?: 5.7.6
- What operating system does the GRR server run on? n/a
- What operating system does the affected GRR client run on, if applicable? n/a

**Describe the issue**
Current `fsevents` package version(ex: [package-lock.json](https://github.com/google/grr/blob/master/grr/server/grr_response_server/gui/static/package-lock.json#L2813)) is vulnerable to a [critical vulnerability](https://security.snyk.io/vuln/SNYK-JS-FSEVENTS-5487987).

**Error logs**
n/a

**Additional context**
If possible please upgrade the `fsevents` package version (`>= 2.3.2`) for the next release.