Bump Microsoft.NET.Test.Sdk from 17.9.0 to 18.7.0

---
updated-dependencies:
- dependency-name: Microsoft.NET.Test.Sdk
  dependency-version: 18.7.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

Tests/Tests.csproj

@@ -9,7 +9,7 @@
     <PackageReference Include="xunit" Version="2.7.1" />
     <PackageReference Include="Verify.Xunit" Version="24.1.0" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.5.8" PrivateAssets="all" />
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.9.0" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.7.0" />
     <ProjectReference Include="..\Visualize.Fody\Visualize.Fody.csproj" />
     <ProjectReference Include="..\Visualize\Visualize.csproj" />
     <ProjectReference Include="..\AssemblyToProcess\AssemblyToProcess.csproj" />