Bump Microsoft.NET.Test.Sdk from 17.6.2 to 18.3.0

---
updated-dependencies:
- dependency-name: Microsoft.NET.Test.Sdk
  dependency-version: 18.3.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

Sharpen.Analyzer/Sharpen.Analyzer/Sharpen.Analyzer.Tests/Sharpen.Analyzer.Tests.csproj

@@ -10,7 +10,7 @@
     <ItemGroup>
         <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Analyzer.Testing.XUnit" Version="1.1.2" />
         <PackageReference Include="Microsoft.CodeAnalysis.CSharp.CodeFix.Testing.XUnit" Version="1.1.2" />
-        <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.6.2" />
+        <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.3.0" />
         <PackageReference Include="NuGet.Common" Version="6.5.0" />
         <PackageReference Include="NuGet.Packaging" Version="6.5.0" />
         <PackageReference Include="NuGet.Protocol" Version="6.5.0" />