chore(deps): Update .net deps

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
Google.Protobuf	nuget	patch	3.24.1 -> 3.24.2
Grpc.Net.Client	nuget	minor	2.55.0 -> 2.56.0
Microsoft.NET.Test.Sdk	nuget	patch	17.7.1 -> 17.7.2

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Release Notes

grpc/grpc-dotnet (Grpc.Net.Client)

v2.56.0

What's Changed

• Update version to 2.56.0 (on v2.56.x branch) by @​jtattermusch in https://github.com/grpc/grpc-dotnet/pull/2251

Full Changelog: grpc/grpc-dotnet@v2.56.0-pre2...v2.56.0

microsoft/vstest (Microsoft.NET.Test.Sdk)

v17.7.2

What's Changed

• Fix cannot find System.Text.Json by @​nohwnd in https://github.com/microsoft/vstest/pull/4669

Full Changelog: microsoft/vstest@v17.7.1...v17.7.2

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