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Declare rexml in the test bundle (#3058)

Without multi_xml, Grape parses XML with ActiveSupport::XmlMini, whose
default backend requires rexml/document. rexml has been a bundled gem
rather than a default one since Ruby 3.0, so under Bundler it loads only
when the bundle holds it. Nothing in the Gemfile asked for it: Grape's
XML specs passed only because Danger's kramdown dependency brought it
in. Without Danger they fail with

    LoadError: cannot load such file -- rexml/document

The :test group now declares it, so the specs no longer depend on
Danger. It stays out of the gemspec: an app that parses XML without
multi_xml brings rexml itself.

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

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