update to latest software

Author: mmcky

environment.yml

@@ -11,8 +11,7 @@ dependencies:
     - sphinx-tojupyter==0.3.0
     - sphinxext-rediraffe==0.2.7
     - sphinx-exercise==1.0.1
-    - ghp-import==2.1.0
-    - sphinxcontrib-youtube==1.3.0  #Version 1.3.0 is required as quantecon-book-theme is only compatible with sphinx<=5
+    - sphinxcontrib-youtube==1.4.1
     - sphinx-togglebutton==0.3.2