Update workflow permissions to fix deploy error

[d33bs]

Description

Fixes an error with completing the deploy book jobs which I believe deal with permissions. It's a bit strange as this error doesn't always surface in other areas I've used the action. Just the same, the docs recommend updating to this option (or others) (under "warning").

What is the nature of your change?

• [ ] Content additions or updates (adds or updates content)
• [x] Bug fix (fixes an issue).
• [ ] Enhancement (adds functionality).
• [ ] Breaking change (these changes would cause existing functionality to not work as expected).

Checklist

Please ensure that all boxes are checked before indicating that this pull request is ready for review.

• [x] I have read the CONTRIBUTING.md guidelines.
• [x] My code follows the style guidelines of this project.
• [x] I have performed a self-review of my own contributions.
• [ ] I have commented my content, particularly in hard-to-understand areas.
• [ ] I have made corresponding changes to related documentation (outside of book content).
• [x] My changes generate no new warnings.
• [x] New and existing tests pass locally with my changes.
• [ ] I have added tests that prove my additions are effective or that my feature works.
• [x] I have deleted all non-relevant text in this pull request template.

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[d33bs]

Thanks @vincerubinetti - the settings change is a better one! After making that change and re-running the job, it succeeded. I'm going to close without merge here as a result.