fix: gh-pages CI failing due to forc-migrate

[sdankel]

Description

The github-pages CI action has been failing since the forc-migrate PR was merged, because the plugin needs to be installed in that workflow.

It was also missing from forc-binaries which is needed for us to be able to distribute the binary.

Checklist

• I have linked to any relevant issues.
• I have commented my code, particularly in hard-to-understand areas.
• I have updated the documentation where relevant (API docs, the reference, and the Sway book).
  • If my change requires substantial documentation changes, I have requested support from the DevRel team
• I have added tests that prove my fix is effective or that my feature works.
• I have added (or requested a maintainer to add) the necessary Breaking* or New Feature labels where relevant.
• I have done my best to ensure that my PR adheres to the Fuel Labs Code Review Standards.
• I have requested a review from the relevant team or maintainers.