Find HttpListenerRequest.UserAgent nullable change

Proprietary

Finds accesses to HttpListenerRequest.UserAgent which changed from string to string? in .NET 9. Code that assumes UserAgent is non-null may throw NullReferenceException.

OpenRewrite.Recipes.CSharp.Migration.Dotnet.Net9.FindHttpListenerRequestUserAgent
mod run . --recipe=OpenRewrite.Recipes.CSharp.Migration.Dotnet.Net9.FindHttpListenerRequestUserAgent

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