Update utoipa-swagger-ui requirement from 3.1.3 to 6.0.0

Updates the requirements on [utoipa-swagger-ui](https://github.com/juhaku/utoipa) to permit the latest version.
- [Release notes](https://github.com/juhaku/utoipa/releases)
- [Commits](juhaku/utoipa@utoipa-swagger-ui-3.1.3...utoipa-swagger-ui-6.0.0)

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

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

Cargo.toml

@@ -31,5 +31,5 @@ axum = { version = "0.6.1", features = ["headers", "macros"] }
 tokio = { version = "1.21.2", features = ["macros", "rt-multi-thread"] }
 tower-http = { version = "0.5.0", features = ["cors"] }
 utoipa = { version = "3.3.0", features = ["axum_extras"] }
-utoipa-swagger-ui = { version = "3.1.3", features = ["axum"] }
+utoipa-swagger-ui = { version = "6.0.0", features = ["axum"] }
 hyper = { version = "0.14", features = ["full"] }