chore(deps): bump actix-web in /backend in the minor-and-patch group (#1030)

Bumps the minor-and-patch group in /backend with 1 update: [actix-web](https://github.com/actix/actix-web).


Updates `actix-web` from 4.14.1 to 4.15.0
- [Release notes](https://github.com/actix/actix-web/releases)
- [Changelog](https://github.com/actix/actix-web/blob/main/CHANGES.md)
- [Commits](actix/actix-web@web-v4.14.1...web-v4.15.0)

---
updated-dependencies:
- dependency-name: actix-web
  dependency-version: 4.15.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: minor-and-patch
...

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Author: dependabot[bot]