Update MediatR requirement from 9.* to 10.*

[dependabot]

Updates the requirements on MediatR to permit the latest version.

Release notes

Sourced from MediatR's releases.

10.0.0

This release adds support for IAsyncEnumerable<T>. A new request type, IStreamRequest<T> represents a request to create a stream, with a new handler type IStreamRequestHandler<TRequest, TResponse> to handle. An example:

public class StreamPing : IStreamRequest<Pong>
{
    public string? Message { get; init; }
}
public class PingStreamHandler : IStreamRequestHandler<StreamPing, Pong>
{
public async IAsyncEnumerable<Pong> Handle(StreamPing request,
[EnumeratorCancellation] CancellationToken cancellationToken)
{
yield return await Task.Run(() => new Pong { Message = request.Message + " Pang" }, cancellationToken);
}
}

Where the work inside of the handler would likely be calling some other streaming API, such as gRPC, EF Core streaming support, Dapper streaming etc.

There are also separate behaviors, with IStreamPipelineBehavior that are separate from the normal IPipelineBehavior.

With the addition of IAsyncEnumerable, this release now targets netstandard2.1 exclusively.

There are some breaking API changes, called out in the 10.0 migration guide.

Commits

• dad92f3 Fixing release workflow
• 682ee41 Updating readme to include contracts package
• 290f80a Merge pull request #687 from jbogard/reference-contracts-package
• bcb1aa7 Referencing contracts package
• b152d92 Merge pull request #686 from jbogard/contracts-assembly
• b2b0222 Creating a contracts package
• a533cf2 Adding contracts assembly
• 802e4a4 Merge pull request #685 from jbogard/separate-stream-request
• c9e248f Separating stream requests into their own interface; adding generic constraints
• 8492e9e Merge pull request #684 from jbogard/csharp10
• Additional commits viewable in compare view

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[dependabot]

Superseded by #825.