Cleanup: Fix clang compile warning

Use a reference instead of copying the string.

Differential Revision: https://developer.blender.org/D10411

source/blender/nodes/geometry/node_geometry_util.cc

@@ -38,7 +38,7 @@ void gather_attribute_info(Map<std::string, AttributeInfo> &attributes,
     }
     const GeometryComponent &component = *set.get_component_for_read(component_type);
 
-    for (const std::string name : component.attribute_names()) {
+    for (const std::string &name : component.attribute_names()) {
       if (ignored_attributes.contains(name)) {
         continue;
       }