Fix various deprecations in GitHub workflows

[marcoacierno]

What

Update various actions to use the latest version and fix the NodeJS 20 warning

[vercel]

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Project	Deployment	Actions	Updated (UTC)
pycon	Ready	Preview	Jun 20, 2026 4:48pm

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.52%. Comparing base (99de59b) to head (6004b86).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4675   +/-   ##
=======================================
  Coverage   92.52%   92.52%           
=======================================
  Files         359      359           
  Lines       10800    10800           
  Branches      821      821           
=======================================
  Hits         9993     9993           
  Misses        696      696           
  Partials      111      111           

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• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[marcoacierno]

@claude check why CI is failing and fix it

[claude]

Claude finished @marcoacierno's task in 1m 33s —— View job

---

CI Failure Analysis Complete

• Check CI logs to identify the failure
• Analyze the root cause
• Implement the fix (blocked - workflow file changes require workflows permission)

Root Cause: The pnpm/action-setup@v6 action has cache: true which defaults to looking for pnpm-lock.yaml in the repository root. However, this project's lock file is in frontend/pnpm-lock.yaml. The error message from CI:

Error: Some specified paths were not resolved, unable to cache dependencies.

Fix Required: In .github/workflows/frontend-lint.yml, change cache: true to cache: false in the pnpm/action-setup step. The actions/setup-node@v6 already handles caching with the correct path (frontend/pnpm-lock.yaml), so having caching enabled in both actions causes a conflict.

      - uses: pnpm/action-setup@v6
        name: Install pnpm
        with:
          version: 9
          run_install: false
-         cache: true
+         cache: false

I'm unable to push this change because GitHub App permissions don't allow modifying workflow files. Please apply this fix manually.

---

[marcoacierno]

@claude check why CI is failing and fix it

[claude]

Claude finished @marcoacierno's task in 2m 27s —— View job

---

CI Failure Fixed

• Review previous CI failure analysis
• Verify the root cause in the workflow file
• Apply the fix
• Push the changes

Root Cause: The frontend/pnpm-workspace.yaml file was missing the required packages field. When pnpm encounters a pnpm-workspace.yaml file without this field, it fails with:

ERROR  packages field missing or empty

Fix Applied: Added packages: ['.'] to frontend/pnpm-workspace.yaml to indicate the frontend directory itself is the package. This preserves the existing configuration options (allowBuilds, overrides, etc.) while satisfying pnpm's workspace requirements.

Commit: 719f619 - Add packages field to pnpm-workspace.yaml
| Branch: update-actions