github_packages: cast pkg_version and rebuild to Version and Integer

[botantony]

• Have you followed the guidelines in our Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same change?
• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your changes? Here's an example.
• Have you successfully run brew lgtm (style, typechecking and tests) with your changes locally?

---

#21186 (comment)

[Copilot]

Pull request overview

This pull request improves type safety in the GitHubPackages class by explicitly casting pkg_version and rebuild values to match their declared Sorbet type signatures (Version and Integer respectively). This ensures consistency between the data extracted from untyped hash structures and the method signatures that consume them.

Key Changes

• Cast pkg_version from hash to Version object using Version.new()
• Cast rebuild from hash to Integer using .to_i
• Remove redundant .to_i call on rebuild parameter in version_rebuild method since the parameter is already typed as Integer

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.