fix(settings): add AST compatibility for Python 3.12+

- Use `ast.Constant` as primary node for Python 3.8+
- Maintain backward compatibility with `ast.Num`, `ast.Str`, and `ast.NameConstant`
- Prevent crashes on Python 3.12 where legacy nodes were removed
- Add safe handling via `try/except AttributeError`

settings.py

@@ -499,12 +499,16 @@ else:
     else:
         # parse settings in a safe way, without exec
         current_settings_dict = {}
+        # Python 3.8+ uses ast.Constant; older versions use ast.Num, ast.Str, ast.NameConstant
         attributes = {
             ast.Constant: 'value',
-            ast.NameConstant: 'value',
-            ast.Num: 'n',
-            ast.Str: 's',
         }
+        try:
+            attributes[ast.Num] = 'n'
+            attributes[ast.Str] = 's'
+            attributes[ast.NameConstant] = 'value'
+        except AttributeError:
+            pass  # Removed in Python 3.12+
         module_node = ast.parse(settings_text)
         for node in module_node.body:
             if type(node) != ast.Assign: