Bump @ember/string from 3.0.1 to 3.1.1

Bumps [@ember/string](https://github.com/emberjs/ember-string) from 3.0.1 to 3.1.1.
- [Release notes](https://github.com/emberjs/ember-string/releases)
- [Changelog](https://github.com/emberjs/ember-string/blob/master/CHANGELOG.md)
- [Commits](emberjs/ember-string@v3.0.1...v3.1.1)

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

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

Author: dependabot[bot]

yarn.lock

@@ -1204,9 +1204,9 @@
     ember-modifier-manager-polyfill "^1.2.0"
 
 "@ember/string@^3.0.1":
-  version "3.0.1"
-  resolved "https://registry.yarnpkg.com/@ember/string/-/string-3.0.1.tgz#42cf032031a4432c2dd69c327ae1876d2c13df9c"
-  integrity sha512-ntnmXS+upOWVXE+rVw2l03DjdMnaGdWbYVUxUBuPJqnIGZu2XFRsoXc7E6mOw62s8i1Xh1RgTuFHN41QGIolEQ==
+  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"