Update utoipa requirement from 3 to 4

Updates the requirements on [utoipa](https://github.com/juhaku/utoipa) to permit the latest version.
- [Release notes](https://github.com/juhaku/utoipa/releases)
- [Commits](juhaku/utoipa@utoipa-3.0.0...utoipa-4.0.0)

---
updated-dependencies:
- dependency-name: utoipa
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

judge-server/Cargo.toml

@@ -13,7 +13,7 @@ tokio = { version = "1", features = ["full"] }
 actix-web = "4"
 
 # Openapi generate
-utoipa = { version = "3", features = ["actix_extras"] }
+utoipa = { version = "4", features = ["actix_extras"] }
 utoipa-swagger-ui = { version = "3", features = ["actix-web"] }
 
 # Support global variable