Bump xunit.runner.visualstudio from 3.1.1 to 3.1.5 (#14)

Updated
[xunit.runner.visualstudio](https://github.com/xunit/visualstudio.xunit)
from 3.1.1 to 3.1.5.

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Directory.Packages.props

@@ -10,7 +10,7 @@
     <PackageVersion Include="StaticCs" Version="0.3.1" />
     <PackageVersion Include="Spectre.Console.Testing" Version="0.46.0" />
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.1.0" />
-    <PackageVersion Include="xunit.runner.visualstudio" Version="3.1.1" />
+    <PackageVersion Include="xunit.runner.visualstudio" Version="3.1.5" />
     <PackageVersion Include="xunit.v3" Version="2.0.3" />
   </ItemGroup>
 </Project>