chore(release): pin PyPI workflow actions

[njzjz-bot]

Fixes #1002.

Pin release-critical checkout, Python setup, and PyPI publishing actions to version tags.

Tests: Workflow YAML inspection; release workflow is not run by unit tests.

Why existing tests missed it: Floating action refs are supply-chain configuration and ordinary Python tests cannot detect their mutation.

Coding agent: Codex
Codex version: codex-cli 0.144.4
Model: gpt-5.6-sol
Reasoning effort: xhigh

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📥 Commits

Reviewing files that changed from the base of the PR and between 0416b54 and 0bdf78a.

📒 Files selected for processing (1)

• .github/workflows/pub-pypi.yml

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[codspeed-hq]

Merging this PR will not alter performance

⚠️ Unknown Walltime execution environment detected

Using the Walltime instrument on standard Hosted Runners will lead to inconsistent data.

For the most accurate results, we recommend using CodSpeed Macro Runners: bare-metal machines fine-tuned for performance measurement consistency.

✅ 2 untouched benchmarks

---

_{Comparing njzjz-bot:fix/issue-1002 (0bdf78a) with master (0416b54)}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.87%. Comparing base (0416b54) to head (0bdf78a).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1026   +/-   ##
=======================================
  Coverage   86.87%   86.87%           
=======================================
  Files          89       89           
  Lines        8266     8266           
=======================================
  Hits         7181     7181           
  Misses       1085     1085           

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