build(amazonq): upgrade to node 24 for setting up release candidate

[chungjac]

Problem

Build runs forever when creating release candidate as there is a node version mismatch.

See: https://github.com/aws/aws-toolkit-vscode/actions/runs/18413496294/job/52471582408

Solution

bump from node 18 to 24

---

• Treat all work as PUBLIC. Private feature/x branches will not be squash-merged at release time.
• Your code changes must meet the guidelines in CONTRIBUTING.md.
• License: I confirm that my contribution is made under the terms of the Apache 2.0 license.

[amazon-inspector-ohio]

⏳ I'm reviewing this pull request for security vulnerabilities and code quality issues. I'll provide an update when I'm done

[amazon-inspector-ohio]

✅ I finished the code review, and didn't find any security or code quality issues.

[chungjac]

Actually completed after 14 minutes (normally takes 15 seconds)