Merge pull request #372 from ember-template-lint/dependabot/npm_and_yarn/broccoli-concat-3.7.1

Author: dependabot[bot]

yarn.lock

@@ -1032,8 +1032,8 @@ broccoli-clean-css@^1.1.0:
     json-stable-stringify "^1.0.0"
 
 broccoli-concat@^3.2.2, broccoli-concat@^3.4.0:
-  version "3.7.0"
-  resolved "https://registry.yarnpkg.com/broccoli-concat/-/broccoli-concat-3.7.0.tgz#6407fd411bc0bdf70a1aa607e382a7fa214e55bb"
+  version "3.7.1"
+  resolved "https://registry.yarnpkg.com/broccoli-concat/-/broccoli-concat-3.7.1.tgz#22ba97420b33f5254549adc5bc41163f97bd1793"
   dependencies:
     broccoli-debug "^0.6.4"
     broccoli-kitchen-sink-helpers "^0.3.1"