Update type of github.ref_protected to boolean

[chrismuellner]

Why:

Closes #20456

What's being changed (if available, include any code snippets, screenshots, or gifs):

Update type of property github.ref_protected from string to boolean.

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Content directory changes

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Source	Preview	Production	What Changed
actions/learn-github-actions/contexts.md	fpt ghec ghes@ 3.6 3.5 3.4 3.3 3.2 ghae	fpt ghec ghes@ 3.6 3.5 3.4 3.3 3.2 ghae

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ghec: GitHub Enterprise Cloud
ghes: GitHub Enterprise Server
ghae: GitHub AE

[cmwilson21]

@chrismuellner Thanks for opening a PR and linking it to your issue! ✨

I'll get this triaged for review ⚡

[jc-clark]

Thank you for contributing and great catch, @chrismuellner! I'll go ahead and merge this PR. 🌟

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