Bump xunit.runner.visualstudio from 3.0.2 to 3.1.5 (#155)

---
updated-dependencies:
- dependency-name: xunit.runner.visualstudio
  dependency-version: 3.1.5
  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]

VaughanTests/VaughanTests.fsproj

@@ -25,7 +25,7 @@
   <ItemGroup>
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.5.1" />
     <PackageReference Include="xunit" Version="2.9.3" />
-    <PackageReference Include="xunit.runner.visualstudio" Version="3.0.2" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="3.1.5" />
     <PackageReference Include="FsCheck.Xunit" Version="3.3.3" />
     <PackageReference Include="FsUnit.xUnit" Version="7.1.1" />
   </ItemGroup>