chore(deps): update dependency ember-test-selectors to v7

Author: renovate[bot]

package.json

@@ -84,7 +84,7 @@
     "ember-sortable": "^5.0.0",
     "ember-source": "~3.28.8",
     "ember-template-lint": "^3.6.0",
-    "ember-test-selectors": "^6.0.0",
+    "ember-test-selectors": "^7.1.0",
     "ember-truth-helpers": "^3.1.1",
     "ember-wormhole": "^0.6.0",
     "eslint": "^7.32.0",