Support`sha_pinning_required` for Actions

[sheeeng]

See https://github.blog/changelog/2025-08-15-github-actions-policy-now-supports-blocking-and-sha-pinning-actions/#enforce-sha-pinning.

REST API endpoints for GitHub Actions permissions - GitHub Docs:

• https://docs.github.com/en/rest/actions/permissions?apiVersion=2022-11-28#get-github-actions-permissions-for-an-organization
• https://docs.github.com/en/rest/actions/permissions?apiVersion=2022-11-28#set-github-actions-permissions-for-an-organization
• https://docs.github.com/en/rest/actions/permissions?apiVersion=2022-11-28#get-github-actions-permissions-for-a-repository
• https://docs.github.com/en/rest/actions/permissions?apiVersion=2022-11-28#set-github-actions-permissions-for-a-repository