Bump Microsoft.NET.Test.Sdk from 17.5.0 to 17.6.0

Bumps [Microsoft.NET.Test.Sdk](https://github.com/microsoft/vstest) from 17.5.0 to 17.6.0.
- [Release notes](https://github.com/microsoft/vstest/releases)
- [Changelog](https://github.com/microsoft/vstest/blob/main/docs/releases.md)
- [Commits](microsoft/vstest@v17.5.0...v17.6.0)

---
updated-dependencies:
- dependency-name: Microsoft.NET.Test.Sdk
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

src/Akka.TestKit.NUnit.Tests/Akka.TestKit.NUnit.Tests.csproj

@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
     <AssemblyTitle>Akka.TestKit.NUnit.Tests</AssemblyTitle>
@@ -10,7 +10,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.5.0" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.6.0" />
     <PackageReference Include="NUnit" Version="$(NUnitVersion)" />
     <PackageReference Include="NUnit3TestAdapter" Version="$(NUnitAdapterVersion)" />
   </ItemGroup>

src/Akka.TestKit.NUnit3.Tests/Akka.TestKit.NUnit3.Tests.csproj

@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
     <AssemblyTitle>Akka.TestKit.NUnit3.Tests</AssemblyTitle>
@@ -10,7 +10,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.5.0" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.6.0" />
     <PackageReference Include="NUnit" Version="$(NUnitVersion)" />
     <PackageReference Include="NUnit3TestAdapter" Version="$(NUnitAdapterVersion)" />
   </ItemGroup>