Use utoipa v4

Author: jayvdb

Cargo.toml

@@ -19,11 +19,11 @@ serde = { version = "1.0.159", features = ["derive"] }
 serde_json = "1.0.95"
 thiserror = "1.0.40"
 treediff = { version = "4.0.2", features = ["with-serde-json"], optional = true }
-utoipa = { version = "3.3.0", optional = true }
+utoipa = { version = "4.0", optional = true }
 
 [dev-dependencies]
 expectorate = "1.0"
 rand = "0.8.5"
 serde_json = { version = "1.0.95", features = ["preserve_order"] }
 serde_yaml = "0.9.19"
-utoipa = { version = "3.3.0", features = ["debug"] }
+utoipa = { version = "4.0", features = ["debug"] }