Build problem with sphinx 8

[0-wiz-0]

Building khal 0.11.3 with sphinx 8.0.2 fails with:

Running Sphinx v8.0.2
loading translations [en]... done
making output directory... done
Converting `source_suffix = '.rst'` to `source_suffix = {'.rst': 'restructuredtext'}`.
ERROR: Invalid value `None` in intersphinx_mapping['http://docs.python.org/']. Expected a two-element tuple or list.

Configuration error:
Invalid `intersphinx_mapping` configuration (1 error).
*** Error code 2

The following patch works around this, but I'm not sure if it's correct or if we lose some links this way:

--- doc/source/conf.py.orig     2024-08-06 17:18:55.985963360 +0000
+++ doc/source/conf.py
@@ -309,4 +309,4 @@ texinfo_documents = [


 # Example configuration for intersphinx: refer to the Python standard library.
-intersphinx_mapping = {'http://docs.python.org/': None}
+#intersphinx_mapping = {'http://docs.python.org/': None}

[dvzrv]

Hi! I'm also running into this on Arch Linux and it currently blocks the rebuild of the package.
Feedback on this issue would be much appreciated! 🙏