Use Tailwind's darkMode selector strategy

[javierjulio]

Since #8186 we've been using TailwindCSS v3.4.0 which had a behavioral change with dark mode, in v3.4.1 this was resolved through tailwindlabs/tailwindcss#12717 with a new dark mode "selector" strategy so we should be using that instead going forward. The documentation update in tailwindlabs/tailwindcss.com#1781 includes some additional context. The "class" strategy remains supported, just the ideal one is this new one.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.10%. Comparing base (4fcb727) to head (323a934).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #8264   +/-   ##
=======================================
  Coverage   99.10%   99.10%           
=======================================
  Files         140      140           
  Lines        4018     4018           
=======================================
  Hits         3982     3982           
  Misses         36       36           

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