Bump @ember/string from 3.1.1 to 4.0.1

Bumps [@ember/string](https://github.com/emberjs/ember-string) from 3.1.1 to 4.0.1.
- [Release notes](https://github.com/emberjs/ember-string/releases)
- [Changelog](https://github.com/emberjs/ember-string/blob/main/CHANGELOG.md)
- [Commits](https://github.com/emberjs/ember-string/commits)

---
updated-dependencies:
- dependency-name: "@ember/string"
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

docs/package.json

@@ -32,7 +32,7 @@
     "@babel/plugin-proposal-decorators": "^7.25.9",
     "@ember-data/adapter": "^5.3.8",
     "@ember/optional-features": "^2.2.0",
-    "@ember/string": "^3.1.1",
+    "@ember/string": "^4.0.1",
     "@ember/test-helpers": "^5.2.2",
     "@ember/test-waiters": "^3.1.0",
     "@eslint/js": "^9.19.0",