Bump xunit.runner.visualstudio from 2.5.7 to 3.1.5 (#66)

---
updated-dependencies:
- dependency-name: xunit.runner.visualstudio
  dependency-version: 3.1.5
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

GlennLibTests/GlennLibTests.csproj

@@ -13,7 +13,7 @@
         <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.7.0" />
         <PackageReference Include="SixLabors.ImageSharp" Version="3.1.7" />
         <PackageReference Include="xunit" Version="2.7.0" />
-        <PackageReference Include="xunit.runner.visualstudio" Version="2.5.7">
+        <PackageReference Include="xunit.runner.visualstudio" Version="3.1.5">
             <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
             <PrivateAssets>all</PrivateAssets>
         </PackageReference>