Fix pip cache error handling on Windows.

[priyagupta108]

Description:
This pull request improves error handling for the pip cache directories on Windows.

Related issue:
#1034

Check list:

• Mark if documentation changes are required.
• Mark if tests were added or updated to cover the changes.

[Copilot]

Pull request overview

This pull request adjusts how setup-python determines the pip cache directory on Windows so that pip warnings written to stderr (notably newer pip deprecation warnings) don’t incorrectly fail caching.

Changes:

• Initialize Windows pip-cache exit status as success by default, avoiding false failures when pip emits warnings on stderr.
• Add Windows-specific try/catch around pip cache dir execution to handle true failures more explicitly (and update the built dist/ output accordingly).

Reviewed changes

Copilot reviewed 1 out of 2 changed files in this pull request and generated 2 comments.

File	Description
src/cache-distributions/pip-cache.ts	Updates Windows pip cache directory detection to avoid treating stderr warnings as failures.
dist/setup/index.js	Regenerated bundled output reflecting the updated Windows pip cache logic.

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