xml: Make XmlSerialize trait more precise

crates/dav/src/privileges.rs

@@ -35,7 +35,6 @@ impl XmlSerialize for UserPrivilegeSet {
         .serialize(ns, tag, namespaces, writer)
     }
 
-    #[allow(refining_impl_trait)]
     fn attributes<'a>(&self) -> Option<Vec<quick_xml::events::attributes::Attribute<'a>>> {
         None
     }

crates/dav/src/xml/tag_list.rs

@@ -57,7 +57,6 @@ impl XmlSerialize for TagList {
         Ok(())
     }
 
-    #[allow(refining_impl_trait)]
     fn attributes<'a>(&self) -> Option<Vec<quick_xml::events::attributes::Attribute<'a>>> {
         None
     }