Fix CI caused by sphinx_toolbox (#1628)

PeterC-DLS · web-flow · commit a0662df1a07c · 2026-04-01T08:37:32.000-07:00
Restrict sphinx version to be less than 9 as noted in sphinx-toolbox/sphinx-toolbox#201
diff --git a/requirements.txt b/requirements.txt
@@ -4,7 +4,7 @@ pyyaml
 nyaml>=0.2.2
 
 # Documentation building
-sphinx>=5
+sphinx<9
 sphinx-tabs
 sphinx-toolbox
 chios
