ci: move Node to 24 LTS and bump GitHub Actions

[thedavidweng]

Why

Node 20 is EOL. GitHub Actions runners now force Node-20 JS actions onto Node 24, the current Active LTS.

What

• Pin Node to 24
• Upgrade outdated Actions so they natively run on Node 24

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro Plus

Run ID: 3334d3f2-7c3d-4bb5-951b-7e1188e248b5

📥 Commits

Reviewing files that changed from the base of the PR and between 221f989 and d5f9f71.

📒 Files selected for processing (3)

• .github/workflows/ci.yml
• .github/workflows/codeql.yml
• .github/workflows/dependabot-automerge.yml

---

_{Comment @coderabbitai help to get the list of available commands.}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.2%. Comparing base (7a1ffdb) to head (d5f9f71).
⚠️ Report is 3 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##            main    #203     +/-   ##
=======================================
+ Coverage   77.1%   77.2%   +0.1%     
=======================================
  Files         77      79      +2     
  Lines       2587    2616     +29     
  Branches     776     785      +9     
=======================================
+ Hits        1996    2021     +25     
- Misses       378     380      +2     
- Partials     213     215      +2     

Flag	Coverage Δ
frontend	77.2% <ø> (+0.1%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
frontend	77.2% <ø> (+0.1%)	⬆️
rust	∅ <ø> (∅)
see 7 files with indirect coverage changes

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