Update dependency @ember/test-helpers to v2.7.0

Author: renovate-bot

package.json

@@ -33,7 +33,7 @@
   },
   "devDependencies": {
     "@ember/optional-features": "2.0.0",
-    "@ember/test-helpers": "2.6.2",
+    "@ember/test-helpers": "2.7.0",
     "@embroider/test-setup": "0.50.2",
     "@glimmer/component": "1.1.1",
     "@glimmer/tracking": "1.1.1",

yarn.lock

@@ -1017,10 +1017,10 @@
     mkdirp "^1.0.4"
     silent-error "^1.1.1"
 
-"@ember/test-helpers@2.6.2":
-  version "2.6.2"
-  resolved "https://registry.yarnpkg.com/@ember/test-helpers/-/test-helpers-2.6.2.tgz#8b0856909bec39fcb66cc75cd429fa4a1efc78dd"
-  integrity sha512-Kp1C/PHcMJUAkLkvBQzCKmIgdS/Gm9yCeUkt1q+I7bFC1KHX2bhhKmd6Dxnwe2g6e4sU8RJbOCrJxqnEAH1vgg==
+"@ember/test-helpers@2.7.0":
+  version "2.7.0"
+  resolved "https://registry.yarnpkg.com/@ember/test-helpers/-/test-helpers-2.7.0.tgz#d8e08b614cdd5eac647689d655e78e1de725f474"
+  integrity sha512-eWFtw5+sbci1Fw+E+HoyaMxY126LvK7jul6i8tad48zlWoxrOalbhJhz1mKqIo4daHbqIZWuFgQhOib4QfTKCQ==
   dependencies:
     "@ember/test-waiters" "^3.0.0"
     broccoli-debug "^0.6.5"