bump API version to '0.9.0'

Author: Mr-Leshiy

catalyst-gateway/bin/src/service/api/mod.rs

@@ -23,7 +23,7 @@ pub(crate) mod health;
 const API_TITLE: &str = "Catalyst Gateway";
 
 /// The version of the API
-const API_VERSION: &str = "0.8.0";
+const API_VERSION: &str = "0.9.0";
 
 /// Get the contact details for inquiring about the API
 fn get_api_contact() -> ContactObject {