Release version 1.8.1 of the `github-actions` package

[github-actions[bot]]

Checks

• [x] The updated version in the package.json and package-lock.json is correct.
• [x] The changelog is correct.

  Next steps

  1. Approve this PR to allow the next workflow creates a new release.

  2. Merge this PR after the new release is successfully created and the version tags are updated.

     2023-07-24 (1.8.1)

     Bug Fixes 🐛

• Get Plugin releases Action: Fix error counting RC releases. (https://github.com/woocommerce/grow/pull/66)

  Tweaked 🔧

• Reorganize the package directory structure for the GitHub custom actions. (https://github.com/woocommerce/grow/pull/61)

[github-actions[bot]]

New release has been created: github-actions 1.8.1