Auto-update the dotnet SDK

[kfcampbell]

This PR uses the gr2m/create-or-update-pull-request-action@cd-path Action to autogenerate commits to the octokit/dotnet-sdk repo.

[kfcampbell]

@nickfloyd do you mind sharing the versions of .NET, Go, and Kiota you used to create the initial commit of the dotnet-sdk? I can reproduce these build errors locally.

[kfcampbell]

Ahh, I got it working locally. Builds should succeed with a version bump for Kiota's helpers, done in octokit/dotnet-sdk#2.

In the future, we should do something for .NET like we do for Go in post-processing, where the latest versions of the helpers are always installed. That way, the helper package versions will keep updated in lockstep with Kiota versions and we can ensure compatability.

[kfcampbell]

Woohoo! The build is now successful and octokit/dotnet-sdk#3 has been created for the changes. I'm going to publish this PR now.

@nickfloyd when you review, do you mind double-checking the namespacing? I may have messed something up, I'm seeing this in the diff:

- namespace GitHub.Octokit.Advisories {
+ namespace Octokit.Client.Advisories {

Maybe that's expected?

[nickfloyd]

Just a quick update to the namespace - all of the other extended source follows the GitHub prefix.