try a different sphinx version

Author: HumphreyYang

environment.yml

@@ -13,6 +13,7 @@ dependencies:
     - sphinx-exercise==1.2.1
     - sphinx-proof==0.4.0
     - sphinxcontrib-youtube==1.5.0
+    - sphinx>=7,<7.4.7
     - sphinx-togglebutton==0.4.5
     - sphinx-reredirects==1.1.0