TlsHandshakeType value 24 should be labeled KeyUpdate

[ritchiecarroll]

https://github.com/microsoft/reverse-proxy/blob/8970c8ded8b47089ef37aab780b0e35648c99adf/src/ReverseProxy/Utilities/TlsFrameHelper.cs#L39

See similar issue and PR in dotnet/runtime:
dotnet/runtime#66781
dotnet/runtime#66786

[karelz]

Triage: Technically it is a breaking change, so we should fix it in 2.0.