chore(perm-dev): Updated permissions assigned to GithubToken

[actuarysailor]

Proposed changes

Updated the permissions needed to run this action according to the permissions it requires. Some people have the GitHub Token permissions defined in a least permissive manner, so this will allow them to fork your repo and more clearly identify inherent permissions being granted.

Checklist

Put an x in the boxes that apply. You can also fill these out after creating the PR. If you're unsure about any of them, don't hesitate to ask. We're here to help! This is simply a reminder of what we are going to look for before merging your code.

• [x] I have added tests that prove my fix is effective or that my feature works
• [x] I have added necessary documentation (if appropriate)
• [x] Any dependent changes have been merged and published in downstream modules

Further comments

This is a super small update just granting the default github.token used by an action the correct permissions required.

[AlbertHernandez]

Hey @actuarysailor, thank you for the PR ❤️