Return a slice in StmtClassDef#bases (#6311)

Slices are strictly more flexible, since you can always convert to an
iterator, etc., but not the other way around. Suggested in
https://github.com/astral-sh/ruff/pull/6259#discussion_r1282730994.

crates/ruff_python_semantic/src/analyze/function_type.rs

@@ -42,7 +42,7 @@ pub fn classify(
         FunctionType::StaticMethod
     } else if matches!(name, "__new__" | "__init_subclass__" | "__class_getitem__")
     // Special-case class method, like `__new__`.
-        || class_def.bases().any(|expr| {
+        || class_def.bases().iter().any(|expr| {
             // The class itself extends a known metaclass, so all methods are class methods.
             semantic
                 .resolve_call_path(map_callable(expr))