Bump Microsoft.NET.Test.Sdk from 18.4.0 to 18.6.0

---
updated-dependencies:
- dependency-name: Microsoft.NET.Test.Sdk
  dependency-version: 18.6.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

test/NosCore.ParserInputGenerator.Tests/NosCore.ParserInputGenerator.Tests.csproj

@@ -8,7 +8,7 @@
 
 	<ItemGroup>
 		<PackageReference Include="Microsoft.IdentityModel.JsonWebTokens" Version="8.17.0" />
-		<PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.4.0" />
+		<PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.6.0" />
 		<PackageReference Include="MSTest.TestAdapter" Version="4.2.1" />
 		<PackageReference Include="MSTest.TestFramework" Version="4.2.1" />
 		<PackageReference Include="System.IdentityModel.Tokens.Jwt" Version="8.17.0" />