Allow ember-truth-helpers v5 as dependency (#1003)

* Allow `ember-truth-helpers` v5 as dependency

* Test ember-truth-helpers 4.x with older ember-source version

Author: mkszepp

ember-basic-dropdown/package.json

@@ -69,7 +69,7 @@
     "ember-element-helper": "^0.8.7",
     "ember-modifier": "^4.2.0",
     "ember-style-modifier": "^4.4.0",
-    "ember-truth-helpers": "^4.0.3"
+    "ember-truth-helpers": "^4.0.3 || ^5.0.0"
   },
   "devDependencies": {
     "@babel/core": "^7.27.1",