chore: add missing ember/string dependency

Author: Techn1x

package.json

@@ -30,6 +30,7 @@
   },
   "devDependencies": {
     "@ember/optional-features": "^2.0.0",
+    "@ember/string": "^4.0.0",
     "@glimmer/component": "^1.0.3",
     "@glimmer/tracking": "^1.0.3",
     "babel-eslint": "^10.1.0",
@@ -59,6 +60,9 @@
     "release-it": "^14.2.1",
     "release-it-lerna-changelog": "^3.1.0"
   },
+  "peerDependencies": {
+    "@ember/string": "^3.1.1 || ^4.0.0"
+  },
   "engines": {
     "node": "10.* || 12.* || >= 14"
   },

yarn.lock

@@ -1165,6 +1165,11 @@
     mkdirp "^1.0.4"
     silent-error "^1.1.1"
 
+"@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@^1.7.1":
   version "1.7.2"
   resolved "https://registry.yarnpkg.com/@ember/test-helpers/-/test-helpers-1.7.2.tgz#5b128dc5f6524c3850abf52668e6bd4fda401194"