Bump actix-http in /code-samples/serving/cloudevents/cloudevents-rust (#6624)

Bumps [actix-http](https://github.com/actix/actix-web) from 2.0.0 to 2.2.2.
- [Release notes](https://github.com/actix/actix-web/releases)
- [Changelog](https://github.com/actix/actix-web/blob/main/CHANGES.md)
- [Commits](actix/actix-web@awc-v2.0.0...http-v2.2.2)

---
updated-dependencies:
- dependency-name: actix-http
  dependency-version: 2.2.2
  dependency-type: indirect
...

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