Use one more kwarg

Author: adamtheturtle

docs/source/conf.py

@@ -39,7 +39,7 @@
 # This method of getting the release from the version goes hand in hand with
 # the ``post-release`` versioning scheme chosen in the ``setuptools-scm``
 # configuration.
-release = version.split(".post")[0]
+release = version.split(sep=".post")[0]
 
 
 project_metadata = importlib.metadata.metadata(distribution_name=project)