avoid using removed api apring_config_toml

Author: kazuk

src/lib.rs

@@ -60,7 +60,7 @@ pub unsafe extern "C" fn spring_config_toml(
     let s = CStr::from_ptr(overwrite_config_toml);
     let s = s.to_str().expect("failed to parse TOML string into UTF-8");
 
-    let config = springql_core::api::spring_config_toml(s).expect("failed to parse TOML config");
+    let config = springql_core::api::SpringConfig::new(s).expect("failed to parse TOML config");
     SpringConfig::new(config).into_ptr()
 }