`LoggerProviderCollection` should not be `IDisposable`

[nblumhardt]

The providers within it are generally owned by the composition system, e.g. https://github.com/serilog/serilog-extensions-logging/blob/dev/samples/Sample/Program.cs#L31 - so it has no business disposing them :-)

[nblumhardt]

Second thoughts, this needs a careful look, providers may not be flushed if they're not otherwise disposed by the DI container.

[SimonCropp]

given v3 has been released. is this included in that milestone? and should the milestone be closed

[nblumhardt]

Thanks 👍