doc: Updated devel/ruby-zeitwerk to 2.5.4

I forgot to mention these changes.

2.5.3 (2021-12-30)

* The change introduced in 2.5.2 implied a performance regression that
  was particularly dramatic in Ruby 3.1.  We'll address #198 in a
  different way.

2.5.2 (2021-12-27)

* When Module#autoload triggers the autovivification of an implicit
  namespace, $LOADED_FEATURES now gets the correspoding directory
  pushed.  This is just a tweak to Zeitwerk's Kernel#require
  decoration.  That way it acts more like the original, and cooperates
  better with other potential Kernel#require wrappers, like
  Bootsnap's.

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