Bump sprockets from 3.7.1 to 3.7.2 in /test_apps/test_app_rails_5_1#3

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dependabot/bundler/test_apps/test_app_rails_5_1/sprockets-3.7.2webhoernchen/massassignment_security_form:dependabot/bundler/test_apps/test_app_rails_5_1/sprockets-3.7.2Copy head branch name to clipboard