build(deps): bump actix-http from 3.11.2 to 3.12.1 in /examples

Bumps [actix-http](https://github.com/actix/actix-web) from 3.11.2 to 3.12.1.
- [Release notes](https://github.com/actix/actix-web/releases)
- [Changelog](https://github.com/actix/actix-web/blob/main/CHANGES.md)
- [Commits](actix/actix-web@http-v3.11.2...http-v3.12.1)

---
updated-dependencies:
- dependency-name: actix-http
  dependency-version: 3.12.1
  dependency-type: indirect
...

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Author: dependabot[bot]