fix resolution of @ember/test-waiter in consumers

repo using ember-material-modifier could not resolve test-waiters

See explanation NullVoxPopuli/ember-resources#407 (comment)

ember-material-modifier/package.json

@@ -30,7 +30,6 @@
   },
   "dependencies": {
     "@ember/string": "3.0.0",
-    "@ember/test-waiters": "3.0.2",
     "@embroider/addon-shim": "1.8.3",
     "ember-modifier": "3.2.7"
   },
@@ -40,6 +39,7 @@
     "@babel/plugin-proposal-class-properties": "7.18.6",
     "@babel/plugin-proposal-decorators": "7.19.0",
     "@babel/plugin-syntax-decorators": "7.19.0",
+    "@ember/test-waiters": "3.0.2",
     "@embroider/addon-dev": "1.8.3",
     "@rollup/plugin-babel": "5.3.1",
     "ember-template-lint": "4.14.0",
@@ -52,6 +52,7 @@
     "rollup": "2.79.0"
   },
   "peerDependencies": {
+    "@ember/test-waiters": "3.0.2",
     "@material/animation": "*",
     "@material/auto-init": "*",
     "@material/banner": "*",
@@ -105,6 +106,9 @@
     "@material/typography": "*"
   },
   "peerDependenciesMeta": {
+    "@ember/test-waiters": {
+      "optional": true
+    },
     "@material/animation": {
       "optional": true
     },