Fix up logger .warn() calls to use .warning() instead

This is a usage that was deprecated in Python 3.0.

awx/main/management/commands/inventory_import.py

@@ -79,13 +79,13 @@ class AnsibleInventoryLoader(object):
         ee = get_default_execution_environment()
 
         if settings.IS_K8S:
-            logger.warn('This command is not able to run on kubernetes-based deployment. This action should be done using the API.')
+            logger.warning('This command is not able to run on kubernetes-based deployment. This action should be done using the API.')
             sys.exit(1)
 
         if ee.credential:
             process = subprocess.run(['podman', 'image', 'exists', ee.image], capture_output=True)
             if process.returncode != 0:
-                logger.warn(
+                logger.warning(
                     f'The default execution environment (id={ee.id}, name={ee.name}, image={ee.image}) is not available on this node. '
                     'The image needs to be available locally before using this command, due to registry authentication. '
                     'To pull this image, either run a job on this node or manually pull the image.'