Bump MSTest.TestFramework from 3.10.4 to 4.2.1

[dependabot]

Updated MSTest.TestFramework from 3.10.4 to 4.2.1.

Release notes

Sourced from MSTest.TestFramework's releases.

4.2.1

See the release notes here

4.1.0

See the release notes here

4.0.2

See the release notes here

4.0.1

See the release notes here

4.0.0

What is new?

Assert.That

MSTest v4 adds a new type of assertion, that allows you to write any expression, and it will inspect the result to give you more information on failure. Providing a very flexible way to assert complicated expressions. Here a simple example:

[TestClass]
public sealed class Test1
{
    [TestMethod]
    public void TestMethod1()
    {
        var animal = "Tiger";
        var zoo = new Zoo();
        Assert.That(() => zoo.GetAnimal() == animal);
    }
}

public class Zoo
{
    public string GetAnimal()
    {
        return "Giraffe";
    }
}

Assert.That(() => zoo.GetAnimal() == animal) failed.
Details:
    animal = "Tiger"     
    zoo.GetAnimal() = "Giraffe"

CallerArgumentExpression

CallerArgumentExpression is consumed by all assertions, to make them aware of the expressions used in the assertion. In the example below, we now know what both the expected and actual values are. But also what value they come from, giving us opportunity to provide better error messages:

[TestClass]
public sealed class Test1
{
    [TestMethod]
    public void TestMethod1()
    {
        string animal = null;
        Assert.AreEqual("Giraffe", animal);
    }
}
 ... (truncated)

## 4.0.0-preview.25372.6

This is a prerelease of MSTest v4. Docs on migration from v3 to v4 are in progress. We are working towards addressing the items tracked in #​1285 and #​5762

## 4.0.0-preview.25358.7

This is a prerelease of MSTest v4. Docs on migration from v3 to v4 are in progress. We are working towards addressing the items tracked in https://github.com/microsoft/testfx/issues/1285 and https://github.com/microsoft/testfx/issues/5762

## 3.11.1

See the release notes [here](https://github.com/microsoft/testfx/blob/main/docs/Changelog.md#​3.11.1)

## 3.11.0

See the release notes [here](https://github.com/microsoft/testfx/blob/main/docs/Changelog.md#​3.11.0)

## 3.10.5

See the release notes [here](https://github.com/microsoft/testfx/blob/main/docs/Changelog.md#​3.10.5)


Commits viewable in [compare view](https://github.com/microsoft/testfx/compare/v3.10.4...v4.2.1).
</details>