Update link to github actions docs

.github/workflows/build.yml

@@ -1,4 +1,4 @@
-# For more information see: https://help.github.com/actions/language-and-framework-guides/using-python-with-github-actions
+# For more information see: https://docs.github.com/en/actions/guides/building-and-testing-python
 
 name: Build and test