Auto dependencies upgrade by bot.

[NugetNinja]

Auto dependencies upgrade by bot. This is automatically generated by bot.

The bot tries to fetch all possible updates and modify the project files automatically.

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[what-the-diff]

PR Summary

• Updated xunit library version
  The version of a key software testing tool, xunit, was updated from 2.6.3 to 2.6.4. This should enhance the ability to perform code tests and find any issues more efficiently.

• Updated xunit.runner.visualstudio version
  The version of xunit.runner.visualstudio, a vital package for running our tests within Visual Studio, was updated from 2.5.5 to 2.5.6. This promotes better integration with Visual Studio, hopefully leading to more productive and efficient testing processes.