Bump xunit.runner.visualstudio from 3.1.3 to 3.1.5 (#56)

Updated
[xunit.runner.visualstudio](https://github.com/xunit/visualstudio.xunit)
from 3.1.3 to 3.1.5.

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Directory.Packages.props

@@ -14,7 +14,7 @@
     <PackageVersion Include="System.IO.Abstractions" Version="22.0.15" />
     <PackageVersion Include="System.IO.Abstractions.TestingHelpers" Version="22.0.15" />
     <PackageVersion Include="xunit" Version="2.9.3" />
-    <PackageVersion Include="xunit.runner.visualstudio" Version="3.1.3" />
+    <PackageVersion Include="xunit.runner.visualstudio" Version="3.1.5" />
   </ItemGroup>
   <ItemGroup>
     <GlobalPackageReference Include="Microsoft.Build.Artifacts" Version="6.1.63" />