Bump terser and parcel in /example (#11)

Bumps [terser](https://github.com/terser/terser) to 5.15.1 and updates ancestor dependency [parcel](https://github.com/parcel-bundler/parcel). These dependencies need to be updated together.


Updates `terser` from 3.17.0 to 5.15.1
- [Release notes](https://github.com/terser/terser/releases)
- [Changelog](https://github.com/terser/terser/blob/master/CHANGELOG.md)
- [Commits](terser/terser@v3.17.0...v5.15.1)

Updates `parcel` from 1.12.4 to 2.8.0
- [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/compare/[email protected])

---
updated-dependencies:
- dependency-name: terser
  dependency-type: indirect
- dependency-name: parcel
  dependency-type: direct:production
...

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>