build(deps-dev): bump parcel from 2.15.2 to 2.15.4 in /example

Bumps [parcel](https://github.com/parcel-bundler/parcel) from 2.15.2 to 2.15.4.
- [Release notes](https://github.com/parcel-bundler/parcel/releases)
- [Changelog](https://github.com/parcel-bundler/parcel/blob/v2/CHANGELOG.md)
- [Commits](https://github.com/parcel-bundler/parcel/commits)

---
updated-dependencies:
- dependency-name: parcel
  dependency-version: 2.15.4
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]