build(deps): bump xunit.runner.visualstudio from 2.5.0 to 2.5.1 in /src

Bumps [xunit.runner.visualstudio](https://github.com/xunit/xunit) from 2.5.0 to 2.5.1.
- [Commits](xunit/xunit@2.5.0...2.5.1)

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

Signed-off-by: dependabot[bot] <support@github.com>

src/Akavache.Tests/Akavache.Tests.csproj

@@ -16,7 +16,7 @@
     <PackageReference Include="Microsoft.Reactive.Testing" Version="6.0.0" />
     <PackageReference Include="xunit" Version="2.5.0" />
     <PackageReference Include="xunit.runner.console" Version="2.5.1" />
-    <PackageReference Include="xunit.runner.visualstudio" Version="2.5.0" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.5.1" />
     <PackageReference Include="Xunit.SkippableFact" Version="1.4.13" />
     <PackageReference Include="Xunit.StaFact" Version="1.1.11" />
     <PackageReference Include="ReactiveUI.Testing" Version="19.*" />