fix(uv): make uv lock rule work with platform python runtime

[rickeylev]

A platform runtime is when the interpreter is provided as an absolute path to Python
instead of bundled in the runfiles. The uv lock rule almost worked, it just didn't
handle the runtime files being empty in such a case.

To fix, use an empty depset to satisfy the subsequent APIs that use it.

[gemini-code-assist]

Summary of Changes

Hello @rickeylev, 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 bug in the uv lock rule that prevented it from working correctly with platform Python runtimes. The issue arose because the rule did not properly handle cases where the runtime's associated files were empty. The fix ensures that an empty depset is provided in such scenarios, allowing subsequent API calls to proceed without error and enabling seamless operation with platform-provided Python interpreters.

Highlights

• UV Lock Rule Fix: The uv lock rule has been updated to correctly function with platform Python runtimes. Previously, it failed when the runtime files were empty, which can occur when the interpreter is provided as an absolute path.

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[gemini-code-assist]

Code Review

This pull request provides a simple and effective fix for an issue where the uv lock rule would fail with a platform Python runtime. The change correctly handles cases where runtime.files is None by initializing python_files to an empty depset, preventing downstream errors. The fix is clean, and the corresponding update to the changelog is accurate. The changes look good.