Warnings about Node 12 deprecation with GHA

When building with this action, we see:

Node.js 12 actions are deprecated. For more information see: https://github.blog/changelog/2022-09-22-github-actions-all-actions-will-begin-running-on-node16-instead-of-node12/. Please update the following actions to use Node.js 16: byu-oit/github-action-create-ecr-repo-if-missing@v1