fix: replace Dict with dict

Author: ybastide

moto/sdb/models.py

@@ -100,7 +100,7 @@ def put_attributes(
         domain = self._get_domain(domain_name)
         domain.put(item_name, attributes)
 
-    def domain_metadata(self, domain_name: str) -> Dict[str, Any]:
+    def domain_metadata(self, domain_name: str) -> dict[str, Any]:
         self._validate_domain_name(domain_name)
         domain = self._get_domain(domain_name)
         item_names_size_bytes = 0