Default theme Twenty Twenty One not recognized yet

File mu-plugin/health-check-troubleshooting-mode.php needs an update, adding 'twentytwentyone', in line 35 to recognize the new default theme Twenty Twenty One.

If this theme is installed alone, users currently get a warning in troubleshooting mode, that a default theme needs to be installed.

Sorry for this inconvinient way to report an issue, the GitHub repo seems to be deprecated.

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