chore(deps): bump luxon in /tests/integration/eleventy-site (#5358)

Bumps [luxon](https://github.com/moment/luxon) from 1.28.0 to 1.28.1.
- [Release notes](https://github.com/moment/luxon/releases)
- [Changelog](https://github.com/moment/luxon/blob/master/CHANGELOG.md)
- [Commits](moment/luxon@1.28.0...1.28.1)

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

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