Avoid _settingsIndex overflow

[halter73]

This should be a long similar to CorrelationIdGenerator._lastId now that we don't mod the value stored in _settingsIndex after incrementing.

[davidfowl]

Good catch. Was it long before?

[halter73]

Good catch. Was it long before?

No, but it never grew past _settingsCount which is an int.

aspnetcore/src/Servers/Kestrel/Transport.Sockets/src/SocketConnectionListener.cs

Line 141 in 952ccb4

_settingsIndex = (_settingsIndex + 1) % _settingsCount;