[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

drf_standardized_errors/settings.py

@@ -32,7 +32,7 @@ def user_settings(self) -> Dict[str, Any]:
 
     def __getattr__(self, attr: str) -> Any:
         if attr not in self.defaults:
-            raise AttributeError("Invalid API setting: '%s'" % attr)
+            raise AttributeError(f"Invalid API setting: '{attr}'")
 
         try:
             # Check if present in user settings