Update dependencies to latest versions.

Author: Robert Jackson

package.json

@@ -24,23 +24,23 @@
     "test": "qunit tests/**/*-test.js"
   },
   "dependencies": {
-    "chalk": "^3.0.0",
-    "ember-cli-version-checker": "^3.1.3",
+    "chalk": "^4.1.0",
+    "ember-cli-version-checker": "^5.1.1",
     "glob": "^7.1.6",
-    "inquirer": "^7.0.4",
-    "mkdirp": "^0.5.1",
+    "inquirer": "^7.3.3",
+    "mkdirp": "^1.0.4",
     "silent-error": "^1.1.1",
     "util.promisify": "^1.0.1"
   },
   "devDependencies": {
     "broccoli-test-helper": "^2.0.0",
-    "ember-cli": "~3.15.2",
+    "ember-cli": "~3.20.0",
     "ember-cli-dependency-checker": "^3.2.0",
     "eslint": "^6.8.0",
     "eslint-plugin-node": "^11.0.0",
-    "execa": "^3.4.0",
+    "execa": "^4.0.3",
     "prettier": "^1.19.1",
-    "qunit": "^2.9.3",
+    "qunit": "^2.11.1",
     "release-it": "^12.4.3",
     "release-it-lerna-changelog": "^1.0.3"
   },