github/workflows/post_publish: Set job to trigger on published event instead

[anGie44]

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@breathingdust noticed this job hasn't run since v4.4.0, so reinstating this to the trigger used before migrating to GHA release process.

Output from acceptance testing:

N/A

[ewbankkit]

LGTM 🚀.

[github-actions]

This functionality has been released in v4.7.0 of the Terraform AWS Provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

For further feature requests or bug reports with this functionality, please create a new GitHub issue following the template. Thank you!

[github-actions]

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