actions: Try GitHubSecurityLab/actions-permissions

[anomiex]

Closes MONOREP-235

Proposed changes:

GitHub's code scanner keeps complaining at us about permissions. Let's try the GitHubSecurityLab/actions-permissions action they mentioned in a blog post a few years ago to see how it does on a few of our workflows at analyzing which permissions are required.

Other information:

• Have you written new tests for your changes, if applicable?
• Have you checked the E2E test CI results, and verified that your changes do not break them?
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Jetpack product discussion

None

Does this pull request change what data or activity we track or use?

No

Testing instructions:

• CI happy?

[github-actions]

Thank you for your PR!

When contributing to Jetpack, we have a few suggestions that can help us test and review your patch:

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