Replace styfle/cancel-workflow-action with concurrency

[thislooksfun]

GitHub actions now have a concurrency feature, which is what we were using styfle/cancel-workflow-action to try to replicate. We should switch to the native syntax instead.

[github-actions]

🎉 This issue has been resolved in version 1.0.0-dev.29 🎉

The release is available on:

• npm package (@dev dist-tag)
• GitHub release

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