package.json: Add ember-test-waiters resolution

... to resolve the conflict caused by the `ember-app-scheduler` dependency

Author: Turbo87

package.json

@@ -119,5 +119,8 @@
   "engines": {
     "node": "^14.9.0",
     "npm": "^6.10.2"
+  },
+  "resolutions": {
+    "ember-test-waiters": "^2.0.0"
   }
 }

yarn.lock

@@ -6957,15 +6957,7 @@ ember-test-selectors@5.0.0:
     ember-cli-babel "^7.22.1"
     ember-cli-version-checker "^5.1.1"
 
-ember-test-waiters@^1.1.1:
-  version "1.2.0"
-  resolved "https://registry.yarnpkg.com/ember-test-waiters/-/ember-test-waiters-1.2.0.tgz#c12ead4313934c24cff41857020cacdbf8e6effe"
-  integrity sha512-aEw7YuutLuJT4NUuPTNiGFwgTYl23ThqmBxSkfFimQAn+keWjAftykk3dlFELuhsJhYW/S8YoVjN0bSAQRLNtw==
-  dependencies:
-    ember-cli-babel "^7.11.0"
-    semver "^6.3.0"
-
-ember-test-waiters@^2.0.0:
+ember-test-waiters@^1.1.1, ember-test-waiters@^2.0.0:
   version "2.1.3"
   resolved "https://registry.yarnpkg.com/ember-test-waiters/-/ember-test-waiters-2.1.3.tgz#40fe7b674d5ef1005f665e0e040753f88c5a2175"
   integrity sha512-xDjvq8/1C3b9z3NGpez7aslbq5gsLrxsdjD3apyziHkImh/PTeXZr2bxo/YAUgOwGOtpZ1So0fIsppiSN0u1Ng==