feat: read timeout for github_ip_ranges data source

[kimxogus]

Resolves #1961

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Before the change?

• Adds 5 minutes default timeout for github_ip_ranges data source.

After the change?

• Terraform will stop reading github ip ranges after 5 minutes timeout

Pull request checklist

• Tests for the changes have been added (for bug fixes / features)
• Docs have been reviewed and added / updated if needed (for bug fixes / features)

Does this introduce a breaking change?

Please see our docs on breaking changes to help!

• Yes
• No

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[kimxogus]

Can we write tests for read timeout? I don't know how to write tests for timeouts.

[kfcampbell]

In this case, I don't think writing an integration test to cover timeouts is a great idea because it'd slow down our CI runs too much. Instead, I think manually testing following our instructions here.

[github-actions]

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