Change deprecated version option to python-version (#649)

As per actions/setup-python@6f6fcee

Author: ibnesayeed

source/guides/github-actions-ci-cd-sample/publish-to-test-pypi.yml

@@ -12,7 +12,7 @@ jobs:
     - name: Set up Python 3.7
       uses: actions/setup-python@v1
       with:
-        version: 3.7
+        python-version: 3.7
     - name: Install pep517
       run: >-
         python -m