test: Update sphinx-proof to main branch for Chinese support

Install sphinx-proof directly from GitHub main branch to test the new
Chinese language support features that were recently merged.

Author: mmcky

environment-cn.yml

@@ -13,7 +13,7 @@ dependencies:
     - sphinxext-rediraffe==0.2.7
     - sphinx_reredirects==0.1.4
     - sphinx-exercise==1.0.1
-    - sphinx-proof==0.2.1
+    - git+https://github.com/executablebooks/sphinx-proof.git@main
     - ghp-import==1.1.0
     - sphinxcontrib-youtube==1.4.1 #Version 1.3.0 is required as quantecon-book-theme is only compatible with sphinx<=5
     - sphinx-togglebutton==0.3.2

environment.yml

@@ -11,7 +11,7 @@ dependencies:
     - sphinx-tojupyter==0.3.1
     - sphinxext-rediraffe==0.2.7
     - sphinx-exercise==1.0.1
-    - sphinx-proof==0.2.1
+    - git+https://github.com/executablebooks/sphinx-proof.git@main
     - sphinxcontrib-youtube==1.4.1
     - sphinx-togglebutton==0.3.2
     - sphinx-reredirects==0.1.4