Forward published release events to temporalio/temporal

[stpierre]

What changed?

This adds a GH workflow that runs when a release is published that forwards the event to temporalio/temporal.

Why?

This will let us automatically bump patch releases of the API module in OSS.

How did you test it?

Pre-merge, the workflow cannot be tested due to GH permissions. Once merged, the workflow is self-testing on future changes.

Potential risks

None; if the job fails, the release is still published and updating the API module proceeds manually.

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}