### Summary
Fixed non-deterministic file ordering in the `iter_package_files` function by adding explicit sorting of package files. This change ensures consistent behavior across builds and prevents issues caused by unordered file iteration.

### Changes Made
- Applied `sorted()` to file listings in both Python versions (<3.11 and >=3.11).
- Guaranteed that files are processed in a consistent, lexicographic order.

### Why This Fix?
- Prevents non-deterministic builds caused by unordered file iteration.
- Improves build reproducibility and enables better caching in CI/CD pipelines.
- Simplifies code by enforcing consistent ordering within the function, reducing the need for manual sorting in callers.

### Testing
- Rebuilt the project multiple times and verified that output files are now consistent across builds.
- Compared generated artifacts (e.g., `.json` files) to confirm deterministic ordering.

### Impact
- No functional changes to how files are processed, only improves determinism.
- Safer and more reliable builds, especially in CI environments.

Closes linkedin#265