Bump the dotnet group with 3 updates

Bumps Microsoft.NET.Test.Sdk from 18.5.1 to 18.6.0
Bumps MSTest.TestAdapter from 4.2.2 to 4.2.3
Bumps MSTest.TestFramework from 4.2.2 to 4.2.3

---
updated-dependencies:
- dependency-name: Microsoft.NET.Test.Sdk
  dependency-version: 18.6.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: dotnet
- dependency-name: MSTest.TestAdapter
  dependency-version: 4.2.3
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: dotnet
- dependency-name: MSTest.TestFramework
  dependency-version: 4.2.3
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: dotnet
...

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

Author: dependabot[bot]

samples/snippets/core/testing/unit-testing-vb-mstest/vb/PrimeService.Tests/PrimeService.Tests.vbproj

@@ -7,9 +7,9 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.5.1" />
-    <PackageReference Include="MSTest.TestAdapter" Version="4.2.2" />
-    <PackageReference Include="MSTest.TestFramework" Version="4.2.2" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.6.0" />
+    <PackageReference Include="MSTest.TestAdapter" Version="4.2.3" />
+    <PackageReference Include="MSTest.TestFramework" Version="4.2.3" />
   </ItemGroup>
 
   <ItemGroup>