Bump nokogiri from 1.8.0 to 1.13.6 in /test_apps/test_app_rails_5_1#19

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dependabot/bundler/test_apps/test_app_rails_5_1/nokogiri-1.13.6webhoernchen/massassignment_security_form:dependabot/bundler/test_apps/test_app_rails_5_1/nokogiri-1.13.6Copy head branch name to clipboard