chore(deps): bump preact from 10.26.6 to 10.28.2 in /webapp (#1022)

Bumps [preact](https://github.com/preactjs/preact) from 10.26.6 to 10.28.2.
- [Release notes](https://github.com/preactjs/preact/releases)
- [Commits](preactjs/preact@10.26.6...10.28.2)

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

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

Author: dependabot[bot]