feat: add repository pages public attribute

[btkostner]

This adds a public attribute to repository pages. This controls the accessibility of pages. See the GitHub API docs for more information. Here is the code in go-github. Closes #1045

Note: I'm not a golang programmer, so I'm not 100% sure this is everything that is required

[btkostner]

Bump. This would be very helpful for our enterprise hosting static sites. As of right now, manually setting this field breaks any terraform runs after.

[kfcampbell]

@btkostner sorry for the delay! Somehow I hadn't seen this yet. Would it be possible to alter the test(s) for this resource to include this new functionality? I'm thinking of some kind of addition of an appropriate test in this file.

[kfcampbell]

Thank you for adding a test to capture this behavior! Is this check passing for you? When I run it, I'm getting Check failed: Check 1/1 error: github_repository.test: Attribute 'pages.0.public' expected "false", got "true".

It looks like we're only getting the "public" option, never setting it anywhere. Wouldn't we need some logic in the Create and Update functions to set this attribute?

[github-actions]

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