Bump webp from 0.2.5 to 0.2.6 in /server (#840)

Bumps [webp](https://github.com/jaredforth/webp) from 0.2.5 to 0.2.6.
- [Commits](https://github.com/jaredforth/webp/commits)

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

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