Update NUnit3TestAdapter requirement from 3.17.* to 4.0.*

Updates the requirements on [NUnit3TestAdapter](https://github.com/nunit/nunit3-vs-adapter) to permit the latest version.
- [Release notes](https://github.com/nunit/nunit3-vs-adapter/releases)
- [Commits](nunit/nunit3-vs-adapter@V3.17...V4.0.0)

---
updated-dependencies:
- dependency-name: NUnit3TestAdapter
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

src/SampleApps/SampleApp.Classic.Tests/SampleApp.Classic.Tests.csproj

@@ -12,7 +12,7 @@
 		<PackageReference Include="coverlet.msbuild" Version="3.0.*" />
 		<PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.10.*" />
 		<PackageReference Include="NUnit" Version="3.13.*" />
-		<PackageReference Include="NUnit3TestAdapter" Version="3.17.*" />
+		<PackageReference Include="NUnit3TestAdapter" Version="4.0.*" />
 		<PackageReference Include="Moq" Version="4.16.*" />
 		<ProjectReference Include="..\..\Simplify.Web\Simplify.Web.csproj" />
 		<ProjectReference Include="..\SampleApp.Classic\SampleApp.Classic.csproj" />

src/Simplify.Web.Tests/Simplify.Web.Tests.csproj

@@ -19,7 +19,7 @@
 		<PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.10.*" />
 		<PackageReference Include="Moq" Version="4.16.*" />
 		<PackageReference Include="NUnit" Version="3.13.*" />
-		<PackageReference Include="NUnit3TestAdapter" Version="3.17.*" />
+		<PackageReference Include="NUnit3TestAdapter" Version="4.0.*" />
 		<PackageReference Include="Simplify.Xml" Version="1.3.*" />
 	</ItemGroup>
 	<ItemGroup>