misc: remove arc around mapping source

src/lock_file/update.rs

@@ -1356,7 +1356,7 @@ async fn spawn_solve_conda_environment_task(
     let has_pypi_dependencies = group.has_pypi_dependencies();
 
     // Whether we should use custom mapping location
-    let pypi_name_mapping_location = group.project().pypi_name_mapping_source();
+    let pypi_name_mapping_location = group.project().pypi_name_mapping_source().clone();
 
     tokio::spawn(
         async move {
@@ -1657,7 +1657,7 @@ async fn spawn_solve_pypi_task(
 
     pypi_mapping::amend_pypi_purls(
         environment.project().client().clone(),
-        &pypi_name_mapping_location,
+        pypi_name_mapping_location,
         &mut conda_records,
         None,
     )

src/project/mod.rs

@@ -399,14 +399,12 @@ impl Project {
     }
 
     /// Returns the custom location of pypi-name-mapping
-    pub fn pypi_name_mapping_source(&self) -> MappingSource {
-        self.mapping_source
-            .get_or_init(|| {
-                self.manifest
-                    .pypi_name_mapping_source()
-                    .expect("mapping source should be ok")
-            })
-            .clone()
+    pub fn pypi_name_mapping_source(&self) -> &MappingSource {
+        self.mapping_source.get_or_init(|| {
+            self.manifest
+                .pypi_name_mapping_source()
+                .expect("mapping source should be ok")
+        })
     }
 
     /// Returns the reqwest client used for http networking