Attempt to use the latest sphinx version

cderici · cderici · commit daa9ced17cb3 · 2023-07-10T13:14:26.000-06:00
diff --git a/docs/requirements.txt b/docs/requirements.txt
@@ -1,6 +1,6 @@
 pytz
 pymacaroons
-sphinx==4.3.2
+sphinx
 sphinxcontrib-asyncio
 sphinx_rtd_theme
 websockets
