Update to Node.js 22

When running actions the following warning appears:
> Node.js 20 actions are deprecated. The following actions are running on Node.js 20 and may not work as expected: awslabs/amazon-app-runner-deploy@main. Actions will be forced to run with Node.js 24 by default starting June 2nd, 2026. Node.js 20 will be removed from the runner on September 16th, 2026. Please check if updated versions of these actions are available that support Node.js 24. To opt into Node.js 24 now, set the FORCE_JAVASCRIPT_ACTIONS_TO_NODE24=true environment variable on the runner or in your workflow file. Once Node.js 24 becomes the default, you can temporarily opt out by setting ACTIONS_ALLOW_USE_UNSECURE_NODE_VERSION=true. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

This issue makes issue #54 obsolete.

Start by reviewing the repository's GitHub Actions configuration and the action versions referenced in the warning, including awslabs/amazon-app-runner-deploy@main. Confirm the intended Node.js runtime update and verify that the warning no longer appears when the actions run.

Written by the indexing model from the issue text.