Add explicit @ember/test-waiters dependency

We are using this package in the `DownloadsGraph` component, so we should be explicit about the dependency, instead of relying on other addons bringing this in.

Author: Turbo87

package.json

@@ -56,6 +56,7 @@
     "@ember/optional-features": "2.0.0",
     "@ember/render-modifiers": "2.0.0",
     "@ember/test-helpers": "2.5.0",
+    "@ember/test-waiters": "3.0.0",
     "@embroider/compat": "0.47.1",
     "@embroider/core": "0.47.1",
     "@embroider/webpack": "0.47.1",

yarn.lock

@@ -1171,24 +1171,24 @@
     ember-cli-htmlbars "^5.7.1"
     ember-destroyable-polyfill "^2.0.3"
 
-"@ember/test-waiters@^2.3.0":
-  version "2.4.5"
-  resolved "https://registry.yarnpkg.com/@ember/test-waiters/-/test-waiters-2.4.5.tgz#6e8e34d1bc46a9b0cc22cb11cc5936046e926031"
-  integrity sha512-833JvHtHdEfBfKXgvmw+6oziFOpVfD4NQrc04Ztj59A11K9FPNfZ3P8YydL7LFTtdd7UfJ/cYCLAm+OwUxbotQ==
+"@ember/test-waiters@3.0.0", "@ember/test-waiters@^2.4.3 || ^3.0.0", "@ember/test-waiters@^3.0.0":
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/@ember/test-waiters/-/test-waiters-3.0.0.tgz#b66a35cd5b78ec3c296a6f5f5fb3852780a5d3c8"
+  integrity sha512-z6+gIlq/rXLKroWv2wxAoiiLtgSOGQFCw6nUufERausV+jLnA7CYbWwzEo5R7XaOejSDpgA5d6haXIBsD5j0oQ==
   dependencies:
     calculate-cache-key-for-tree "^2.0.0"
     ember-cli-babel "^7.26.6"
-    ember-cli-typescript "^4.1.0"
     ember-cli-version-checker "^5.1.2"
     semver "^7.3.5"
 
-"@ember/test-waiters@^2.4.3 || ^3.0.0", "@ember/test-waiters@^3.0.0":
-  version "3.0.0"
-  resolved "https://registry.yarnpkg.com/@ember/test-waiters/-/test-waiters-3.0.0.tgz#b66a35cd5b78ec3c296a6f5f5fb3852780a5d3c8"
-  integrity sha512-z6+gIlq/rXLKroWv2wxAoiiLtgSOGQFCw6nUufERausV+jLnA7CYbWwzEo5R7XaOejSDpgA5d6haXIBsD5j0oQ==
+"@ember/test-waiters@^2.3.0":
+  version "2.4.5"
+  resolved "https://registry.yarnpkg.com/@ember/test-waiters/-/test-waiters-2.4.5.tgz#6e8e34d1bc46a9b0cc22cb11cc5936046e926031"
+  integrity sha512-833JvHtHdEfBfKXgvmw+6oziFOpVfD4NQrc04Ztj59A11K9FPNfZ3P8YydL7LFTtdd7UfJ/cYCLAm+OwUxbotQ==
   dependencies:
     calculate-cache-key-for-tree "^2.0.0"
     ember-cli-babel "^7.26.6"
+    ember-cli-typescript "^4.1.0"
     ember-cli-version-checker "^5.1.2"
     semver "^7.3.5"