Update action.yml runs.using from node20 to node24

[yonda]

Description

GitHub Actions is deprecating the Node.js 20 runtime. Node24 will become the default on June 2, 2026, and node20 will be removed in fall 2026.

https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

This PR updates action.yml from runs.using: node20 to runs.using: node24.

Same transition as #2719 (node16 → node20).

Fixes #2948

Type of change

• Bug fix (non-breaking change which fixes an issue)

Screenshots/Sandbox (if appropriate/relevant):

N/A

How Has This Been Tested?

N/A — single-line change in action.yml, no application logic affected.

Checklist:

• I have followed the
  CONTRIBUTING doc and the
  style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules