Remove extra python_version

[eggplants]

What are you trying to accomplish?

Fix: #11529 (comment)

Anything you want to highlight for special attention from reviewers?

None.

How will you know you've accomplished your goal?

Pass tests except Smoke / e2e for smoke-python-pipenv.yaml (Ref: dependabot/smoke-tests#259)

Checklist

• I have run the complete test suite to ensure all tests and linters pass.
• I have thoroughly tested my code changes to ensure they work as expected, including adding additional tests for new functionality.
• I have written clear and descriptive commit messages.
• I have provided a detailed description of the changes in the pull request, including the problem it addresses, how it fixes the problem, and any relevant details about the implementation.
• I have ensured that the code is well-documented and easy to understand.

[robaiken]

@eggplants Thank you so much for your contribution and helping us drop support for python 3.8!