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rack 2.1.0 introduces a deprecation warning
rack/rack@626272b#diff-894804c816a11584eb28499cb8bbe396R6
that rails is triggering,
https://github.com/rails/rails/blob/1e14a2405b5e19b6758842dbd6d377c68d7f57ae/actionpack/lib/action_dispatch/middleware/static.rb#L20
but in later versions this warning will be removed
rack/rack@f80e65d#diff-894804c816a11584eb28499cb8bbe396L6
This warning was causing CI failures on rack 2.1.0:
rack 2.0.8: https://travis-ci.org/rspec/rspec-rails/jobs/635322909
rack 2.1.0: https://travis-ci.org/rspec/rspec-rails/jobs/635434487