Migrate GitHub Action from Node.js 20 before runner deprecation

[c-vigo]

Context

GitHub is deprecating Node.js 20 on Actions runners: Node.js 24 becomes default 2026-06-02; Node.js 20 removed 2026-09-16. See https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

Scope

Update action.yml (and any workflow that pins Node) to use Node 24, run tests, and tag a release so downstream repos (e.g. vig-os/devcontainer workflows using vig-os/commit-action) stay compatible.

References

• Surfaced during RCA for vig-os/devcontainer#453