Add support for the repository_advisory event

[PromoFaux]

Resolves #679

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Before the change?

• Support for this event does not exist

After the change?

• Support for this event exists...

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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[github-actions]

👋 Hi! Thank you for this contribution! Just to let you know, our GitHub SDK team does a round of issue and PR reviews twice a week, every Monday and Friday! We have a process in place for prioritizing and responding to your input. Because you are a part of this community please feel free to comment, add to, or pick up any issues/PRs that are labeled with Status: Up for grabs. You & others like you are the reason all of this works! So thank you & happy coding! 🚀

[PromoFaux]

There are a couple of enums introduced here that could potentially be re-used in other event types - but that is probably for a separate PR if at all :)

[PromoFaux]

@JamieMagee - Am I right in suspecting that this repo is unmaintained?

I see that https://github.com/octokit/dotnet-sdk exists - but have not looked at it too deeply yet - is it meant to replace this one?

(Edit: No pressure to review or respond!)

[JamieMagee]

@PromoFaux apologies for the lack of response here. I lost some permissions in the Octokit org recently, and haven't had a chance to request them back. Until then, I'm not able to merge any PRs or create any releases.

https://github.com/octokit/dotnet-sdk isn't meant to be a replacement for this project, but a replacement for https://github.com/octokit/octokit.net. dotnet-sdk is an experimental SDK automatically generated from https://github.com/github/rest-api-description, whereas octokit.net (and this repository) are manually generated.

[PromoFaux]

No worries, I decided to build locally and include the DLLs directly in my project for the time being (hence the force push after spotting an egregious spelling error 😏) so it's working for my purposes for the time being!

Ah OK, cool - I wont look at that in any further detail then, I only need to process webhooks, this one just happened to be missing.

🤞 for you getting permissions back :)