build(deps-dev): bump preact from 10.26.5 to 10.28.2 in /docs (#675)

Bumps [preact](https://github.com/preactjs/preact) from 10.26.5 to 10.28.2.
- [Release notes](https://github.com/preactjs/preact/releases)
- [Commits](preactjs/preact@10.26.5...10.28.2)

---
updated-dependencies:
- dependency-name: preact
  dependency-version: 10.28.2
  dependency-type: indirect
...

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Author: dependabot[bot]