Update action to support Node.js 24 (Node.js 20 deprecation)

[maksimu]

GitHub Actions is deprecating Node.js 20 runners starting June 2nd, 2026, with Node.js 24 becoming the default. ssm-code-signing@v1.2.1 (the current latest) still runs on Node.js 20, which generates deprecation warnings on every build.

Please update the action's runs.using in action.yml to node24 so it is compatible with the upcoming default.

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

[anshuman-mor]

@maksimu - Thank you for raising this!

ssm-code-signing has been deprecated and will not receive further updates, including this runtime upgrade. We recommend migrating to our successor action:

➡️ digicert/code-signing-software-trust-action

We have just released v1.2.0 which runs on Node.js 24, directly resolving the deprecation warning. Update your workflow as follows:

# Before
- uses: digicert/ssm-code-signing@v1.2.1

# After
- uses: digicert/code-signing-software-trust-action@v1.2.0

Please refer to the README for full details. We recommend migrating before June 2nd, 2026 to avoid pipeline disruption. Let us know if you need any help!