build(deps): bump xunit.runner.console from 2.6.2 to 2.6.4 in /src (#885)

Bumps [xunit.runner.console](https://github.com/xunit/xunit) from 2.6.2 to 2.6.4.
- [Commits](https://github.com/xunit/xunit/compare/2.6.2...2.6.4)

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

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

src/Akavache.Tests/Akavache.Tests.csproj

@@ -15,7 +15,7 @@
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.8.0" />
     <PackageReference Include="Microsoft.Reactive.Testing" Version="6.0.0" />
     <PackageReference Include="xunit" Version="2.6.2" />
-    <PackageReference Include="xunit.runner.console" Version="2.6.2" />
+    <PackageReference Include="xunit.runner.console" Version="2.6.4" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.5.4" />
     <PackageReference Include="Xunit.SkippableFact" Version="1.4.13" />
     <PackageReference Include="Xunit.StaFact" Version="1.1.11" />