Obsolete IPNetwork

[Tratcher]

The BCL is planning a replacement for this type: dotnet/runtime#79946

We should consume theirs when available and obsolete ours.

aspnetcore/src/Middleware/HttpOverrides/src/IPNetwork.cs

Line 13 in 83d6c56

public class IPNetwork

aspnetcore/src/Middleware/HttpOverrides/src/ForwardedHeadersOptions.cs

Line 73 in 83d6c56

public IList<IPNetwork> KnownNetworks { get; } = new List<IPNetwork>() { new IPNetwork(IPAddress.Loopback, 8) };

Consider adding an implicit converter to minimize the breaking changes in the short term.

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We're moving this issue to the .NET 8 Planning milestone for future evaluation / consideration. We would like to keep this around to collect more feedback, which can help us with prioritizing this work. We will re-evaluate this issue, during our next planning meeting(s).
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[stylpe]

This should no longer be blocked, right? I can make a PR for this if you'd like.

There are 3 concrete changes, right?

• Obsolete HttpOverrides.IPNetwork
• Add an implicit conversion from that class to System.Net.IPNetwork
• Change ForwardedHeadersOptions to use System.Net.IPNetwork

That should keep all existing usage working, I think.