fix(ci): use actions/cache for GitHub-hosted runners

[amondnet]

Summary

• Replace runs-on/cache@v4 with actions/cache@v4 for the publish job

Why

runs-on/cache is specific to runs-on.com self-hosted runners. Since PR #41 changed the publish job to use GitHub-hosted runners (ubuntu-latest), we need to use actions/cache instead.

Test plan

• Verify publish workflow runs successfully on next release

[gemini-code-assist]

Note

Gemini is unable to generate a summary for this pull request due to the file types involved not being currently supported.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 48.76%. Comparing base (706d295) to head (4e4b29a).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #42      +/-   ##
==========================================
- Coverage   49.74%   48.76%   -0.99%     
==========================================
  Files          22       22              
  Lines        4535     4561      +26     
==========================================
- Hits         2256     2224      -32     
- Misses       2279     2337      +58     

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