refactor: bump serve-static and parse-server

Bumps [serve-static](https://github.com/expressjs/serve-static) to 2.1.0 and updates ancestor dependency [parse-server](https://github.com/parse-community/parse-server). These dependencies need to be updated together.


Updates `serve-static` from 1.15.0 to 2.1.0
- [Release notes](https://github.com/expressjs/serve-static/releases)
- [Changelog](https://github.com/expressjs/serve-static/blob/master/HISTORY.md)
- [Commits](expressjs/serve-static@v1.15.0...2.1.0)

Updates `parse-server` from 5.5.6 to 8.0.0
- [Release notes](https://github.com/parse-community/parse-server/releases)
- [Changelog](https://github.com/parse-community/parse-server/blob/alpha/CHANGELOG.md)
- [Commits](parse-community/parse-server@5.5.6...8.0.0)

---
updated-dependencies:
- dependency-name: serve-static
  dependency-type: indirect
- dependency-name: parse-server
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]