fix(workflow): compute branch name from pull_request number

[trivikr]

Issue

Follow-up to #174

Description

Computer branch name from pull_request number

Testing

Will be done after PR is merged

Additional context

Docs: https://docs.github.com/developers/webhooks-and-events/webhooks/webhook-events-and-payloads?actionType=closed#pull_request

---

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[changeset-bot]

⚠️ No Changeset found

Latest commit: c06829a

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types

Click here to learn what changesets are, and how to add one.

Click here if you're a maintainer who wants to add a changeset to this PR

[trivikr]

Verified that action successfully deleted cache in workflow run https://github.com/awslabs/aws-sdk-js-codemod/actions/runs/3709390440/jobs/6287961022

[github-actions]

This thread has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs and link to relevant comments in this thread.