Port to Sphinx 8.0 (#832)

Author: cjwatson

docs/conf.py

@@ -330,5 +330,7 @@
 
 
 # Example configuration for intersphinx: refer to the Python standard library.
-intersphinx_mapping = {'https://docs.python.org/3': None,
-                       'http://aiohttp.readthedocs.org/en/stable': None}
+intersphinx_mapping = {
+    'python': ('https://docs.python.org/3', None),
+    'aiohttp': ('http://aiohttp.readthedocs.org/en/stable', None),
+}