Fix halide-llvm lockfile URLs pointing at old pypiserver

[alexreinking]

Summary

Refreshes halide-llvm's three pinned lockfile entries (21.1.8, 22.1.7, 23.0.0.dev100667+g9bf20bdf) via uv lock --refresh-package halide-llvm so their recorded wheel URLs point at halide/pypi (GitHub Releases) instead of the retired pypi.halide-lang.org/packages/... pypiserver path.

Why -- this is not a caching issue, it's permanent

uv.lock records the exact wheel URL and hash per platform for each pinned version, not just a re-resolvable index reference. Now that pypi.halide-lang.org DNS points at halide/pypi (GitHub Releases + Pages) instead of the old MIT-hosted pypiserver, the old /packages/<file> URLs baked into the committed lockfile 404 -- permanently, on every CI run, independent of uv's own HTTP cache (a cold runner with zero cache hits this exactly the same way).

Every hash is unchanged between old and new -- confirms this is purely a URL fix, not a content difference (i.e. the earlier migration to halide/pypi didn't corrupt anything).

Test plan

• uv lock --refresh-package halide-llvm ran clean, pre-commit's "ensure uv.lock is up to date" hook passes.
• Manually diffed every changed line: only the url field changed per wheel; hash is byte-identical old vs. new for all 24 entries.
• Recommend merging this promptly -- until it lands, ci-llvm-21/ci-llvm-22/ci-llvm-main dependency groups fail to install on any fresh checkout or cold CI runner.

[shoaibkamil]

Unless someone's figured out how to make malicious changes without altering sha256 hashes, this looks safe.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 70.22%. Comparing base (0dba9f1) to head (3d7915c).
⚠️ Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9281      +/-   ##
==========================================
+ Coverage   70.14%   70.22%   +0.07%     
==========================================
  Files         257      257              
  Lines       79162    79162              
  Branches    18979    18979              
==========================================
+ Hits        55529    55589      +60     
+ Misses      17881    17874       -7     
+ Partials     5752     5699      -53     

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