[AIRFLOW-XXX] Disable intersphinx loading of requests modules (apac…

…he#5590)

Their website is currently not responding making this inventory
unreachable which is causing all our builds to fail.

(cherry picked from commit b33b989)

docs/conf.py

@@ -237,7 +237,8 @@
     'mongodb': ('https://api.mongodb.com/python/current/', None),
     'pandas': ('https://pandas.pydata.org/pandas-docs/stable/', None),
     'python': ('https://docs.python.org/3/', None),
-    'requests': ('http://docs.python-requests.org/en/master/', None),
+    # TODO: Re-enable when python-requests.org is working again!
+    #'requests': ('http://docs.python-requests.org/en/master/', None),
     'sqlalchemy': ('https://docs.sqlalchemy.org/en/latest/', None),
     'hdfs': ('https://hdfscli.readthedocs.io/en/latest/', None),
 }