mkdocs: replaces deprecated import key with inventories

mkdocs.yml

@@ -55,7 +55,7 @@ plugins:
     handlers:
       python:
         paths: [src]  # search packages in the src folder
-        import:
+        inventories:
           - https://docs.python.org/3/objects.inv
           - https://docs.pydantic.dev/latest/objects.inv
           - https://confz.readthedocs.io/en/latest/objects.inv