chore: pin autopep8 to 2.0.2

[jpadilla]

Description

Pin autopep8 used while running make build-client-python to avoid breaking issue in 2.0.3 release.

References

https://github.com/hhatto/autopep8/issues/702

Review Checklist

• [x] I have clicked on "allow edits by maintainers".
• [ ] I have added documentation for new/changed functionality in this PR or in a PR to openfga.dev [Provide a link to any relevant PRs in the references section above]
• [x] The correct base branch is being used, if not main
• [ ] I have added tests to validate that the change in functionality is working as expected