Update @ember/string to v4 (#375)

Author: RobbieTheWagner

package.json

@@ -39,6 +39,7 @@
   },
   "dependencies": {
     "@babel/core": "^7.28.0",
+    "ember-auto-import": "^2.10.0",
     "ember-cli-babel": "^8.2.0",
     "ember-cli-htmlbars": "^6.3.0"
   },
@@ -47,14 +48,13 @@
     "@babel/helper-function-name": "^7.24.7",
     "@babel/plugin-proposal-decorators": "^7.28.0",
     "@ember/optional-features": "^2.2.0",
-    "@ember/string": "^3.1.1",
+    "@ember/string": "^4.0.1",
     "@ember/test-helpers": "^5.2.2",
     "@embroider/test-setup": "^4.0.0",
     "@glimmer/component": "^1.1.2",
     "@glimmer/tracking": "^1.1.2",
     "broccoli-asset-rev": "^3.0.0",
     "concurrently": "^9.2.0",
-    "ember-auto-import": "^2.10.0",
     "ember-cli": "~5.12.0",
     "ember-cli-clean-css": "^3.0.0",
     "ember-cli-dependency-checker": "^3.3.3",