chore(deps): bump actix-web-lab from 0.27.0 to 0.28.0 in /backend

Bumps [actix-web-lab](https://github.com/robjtede/actix-web-lab) from 0.27.0 to 0.28.0.
- [Release notes](https://github.com/robjtede/actix-web-lab/releases)
- [Commits](robjtede/actix-web-lab@lab-v0.27.0...lab-v0.28.0)

---
updated-dependencies:
- dependency-name: actix-web-lab
  dependency-version: 0.28.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

backend/Cargo.lock

@@ -6,7 +6,7 @@ edition = "2021"
 [dependencies]
 actix-web = "4"
 actix-cors = "0.7"
-actix-web-lab = "0.27"
+actix-web-lab = "0.28"
 tokio = { version = "1", features = ["full"] }
 tokio-stream = { version = "0.1", features = ["sync"] }
 reqwest = { version = "0.12", features = ["json", "rustls-tls", "stream"], default-features = false }