Fix: Adaptations for Pydantic v2 migration and stricter validation

- Updated the display() method to use self.model_config.env_prefix instead of self.Config.env_prefix.
The previous implementation caused an AttributeError because Config is no longer supported in Pydantic v2.

Adjusted the method to align with the new Pydantic v2 configuration approach, which uses model_config for settings validation and customization.

src/aleph/vm/conf.py

@@ -468,7 +468,9 @@ def display(self) -> str:
             else:
                 attributes[attr] = getattr(self, attr)
 
-        return "\n".join(f"{self.Config.env_prefix}{attribute} = {value}" for attribute, value in attributes.items())
+        return "\n".join(
+            f"{self.model_config.env_prefix}{attribute} = {value}" for attribute, value in attributes.items()
+        )
 
     def __init__(
         self,