Bump Microsoft.NET.Test.Sdk from 18.6.0 to 18.7.0 (#125)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

Hourglass.Test/Hourglass.Test.csproj

@@ -27,7 +27,7 @@
     <DebugType>pdbonly</DebugType>
   </PropertyGroup>
   <ItemGroup>
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.6.0" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.7.0" />
     <PackageReference Include="MSTest.TestAdapter" Version="4.2.3" />
     <PackageReference Include="MSTest.TestFramework" Version="4.2.3" />
   </ItemGroup>