Fix typevar reduce for PYPI.

[claudevdm]

Follow up fix for #35422

I did not run tests suites on my original changes in a PYPI env, and there was a bug in the typevar reduce for this case.

This fixes the bug and all tests pass in PYPI env now.

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[claudevdm]

R: @tvalentyn

[gemini-code-assist]

Summary of Changes

Hello @claudevdm, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses a critical bug within the cloudpickle library's typevar reduce functionality, which manifested specifically when running in a PYPI environment. The fix involves a minor but crucial adjustment to the serialization logic for TypeVar objects, ensuring proper handling and allowing all associated tests to pass as expected in the affected environment.

Highlights

• Bug Fix: Resolved a bug in the typevar reduce mechanism that specifically occurred in a PYPI environment, preventing tests from passing.
• Serialization Logic: Modified the save_typevar method in cloudpickle.py to use self.save_reduce instead of self._save_reduce_pickle5 for handling TypeVar objects.
• Test Validation: Confirmed that all tests now pass successfully in the PYPI environment after applying this fix.

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[tvalentyn]

Is this a follow up to some other change?

[claudevdm]

Is this a follow up to some other change?

This is a follow up to #35422

[tvalentyn]

LGTM