Bump zeitwerk from 2.6.14 to 2.6.15 #3009

Job	Run time
Ruby 3.0 / Gemfile / sqlite	1m 0s
Ruby 3.1 / Gemfile / sqlite	51s
Ruby 3.2 / Gemfile / sqlite	50s
Ruby 3.3 / Gemfile / sqlite	57s
Ruby 3.0 / gemfiles/rails_6_0.gemfile / sqlite	1m 24s
Ruby 3.1 / gemfiles/rails_6_0.gemfile / sqlite	47s
Ruby 3.2 / gemfiles/rails_6_0.gemfile / sqlite	46s
Ruby 3.3 / gemfiles/rails_6_0.gemfile / sqlite	1m 16s
Ruby 3.0 / gemfiles/rails_6_1.gemfile / sqlite	51s
Ruby 3.1 / gemfiles/rails_6_1.gemfile / sqlite	56s
Ruby 3.2 / gemfiles/rails_6_1.gemfile / sqlite	54s
Ruby 3.3 / gemfiles/rails_6_1.gemfile / sqlite	1m 6s
Ruby 3.0 / gemfiles/rails_7_0.gemfile / sqlite	1m 15s
Ruby 3.1 / gemfiles/rails_7_0.gemfile / sqlite	52s
Ruby 3.2 / gemfiles/rails_7_0.gemfile / sqlite	49s
Ruby 3.3 / gemfiles/rails_7_0.gemfile / sqlite	56s
Ruby 3.1 / gemfiles/rails_main.gemfile / sqlite	2m 9s
Ruby 3.2 / gemfiles/rails_main.gemfile / sqlite	52s
Ruby 3.3 / gemfiles/rails_main.gemfile / sqlite	1m 18s
Ruby 3.2 / gemfiles/postgresql.gemfile / postgres	56s
	20m 45s

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