docs: Pin Sphinx version

jmgate · jmgate · commit 63731500a530 · 2024-09-10T09:15:11.000-06:00
The Sphinx 8.0.0 release poses a problem for the sphinx-rtd-theme, so
I'm pinning sphinx below 8.0 to get things back up and running.
diff --git a/doc/requirements.txt b/doc/requirements.txt
@@ -1,6 +1,6 @@
 # Requirements for building the `shell-logger` documentation.
 
-sphinx
+sphinx<8.0.0
 sphinx-argparse
 sphinx-autodoc-typehints
 sphinx-copybutton
