Merge branch 'master' into dependabot/pip/kubernetes/kfserving/image_transformer/pillow-8.2.0

Author: msaroufim

.github/workflows/doc-automation.yml

@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.6]
+        python-version: [3.8]
     steps:
     - name: Checkout
       uses: actions/checkout@v2

docs/conf.py

@@ -151,7 +151,7 @@ def setup(app):
 
     # In Sphinx 1.8 it was renamed to `add_css_file`, 1.7 and prior it is
     # `add_stylesheet` (deprecated in 1.8).
-    add_css = getattr(app, 'add_css_file', getattr(app, 'add_stylesheet'))
+    add_css = getattr(app, 'add_css_file')
     for css_file in html_css_files:
         add_css(css_file)