Build(deps-dev): Bump @ember/string from 3.1.1 to 4.0.0 (#27750)

Bumps [@ember/string](https://github.com/emberjs/ember-string) from 3.1.1 to 4.0.0.
- [Release notes](https://github.com/emberjs/ember-string/releases)
- [Changelog](https://github.com/emberjs/ember-string/blob/master/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>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

app/assets/javascripts/discourse/package.json

@@ -41,7 +41,7 @@
     "@ember/legacy-built-in-components": "^0.5.0",
     "@ember/optional-features": "^2.1.0",
     "@ember/render-modifiers": "^2.1.0",
-    "@ember/string": "^3.1.1",
+    "@ember/string": "^4.0.0",
     "@ember/test-helpers": "^3.3.0",
     "@embroider/compat": "^3.5.6",
     "@embroider/core": "^3.4.14",

yarn.lock

@@ -1399,13 +1399,18 @@
     ember-cli-babel "^7.26.11"
     ember-modifier-manager-polyfill "^1.2.0"
 
-"@ember/string@^3.0.0", "@ember/string@^3.1.1":
+"@ember/string@^3.0.0":
   version "3.1.1"
   resolved "https://registry.yarnpkg.com/@ember/string/-/string-3.1.1.tgz#0a5ac0d1e4925259e41d5c8d55ef616117d47ff0"
   integrity sha512-UbXJ+k3QOrYN4SRPHgXCqYIJ+yWWUg1+vr0H4DhdQPTy8LJfyqwZ2tc5uqpSSnEXE+/1KopHBE5J8GDagAg5cg==
   dependencies:
     ember-cli-babel "^7.26.6"
 
+"@ember/string@^4.0.0":
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/@ember/string/-/string-4.0.0.tgz#24fe5cda227c9e6634e6e0b550944a3a13437878"
+  integrity sha512-IMVyVE72twuAMSYcHzWSgtgYTtzlHlKSGW8vEbztnnmkU6uo7kVHmiqSN9R4RkBhzvh0VD4G76Eph+55t3iNIA==
+
 "@ember/test-helpers@^3.3.0":
   version "3.3.0"
   resolved "https://registry.yarnpkg.com/@ember/test-helpers/-/test-helpers-3.3.0.tgz#abf83ff2b111493d25266cb90327134498cb9090"