Fix CI caused by sphinx_toolbox

PeterC-DLS · web-flow · commit bb9d1f1742ec · 2026-04-01T12:16:23.000+01:00
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
