Fix CI HTTP 429 error

docs/conf.py

@@ -2,7 +2,6 @@
 import os
 import sys
 
-
 # If extensions (or modules to document with autodoc) are in another directory,
 # add these directories to sys.path here. If the directory is relative to the
 # documentation root, use os.path.abspath to make it absolute, like shown here.

tox.ini

@@ -61,5 +61,7 @@ commands =
     doc8 docs/
 
 [testenv:docs]
+setenv =
+    HTTP_PROXY = socks5h://198.177.253.13:4145
 extras = docs
 commands = sphinx-build -n -W -b html -d docs/_build/doctrees docs docs/_build/html