Require ember 4.8+ and test-helpers 3.x (#2036)

* use test-helpers 3

* run ember-cli-update

* drop support for ember 4.4

* stricter semver string

.github/workflows/ci.yml

@@ -40,9 +40,9 @@ jobs:
       fail-fast: false
       matrix:
         try-scenario:
-          - ember-lts-4.4
           - ember-lts-4.8
           - ember-lts-4.12
+          - ember-lts-5.4
           - ember-release
           - ember-beta
           - ember-canary

CONTRIBUTING.md

@@ -13,13 +13,13 @@
 
 ## Running tests
 
-* `ember test` – Runs the test suite on the current Ember version
-* `ember test --server` – Runs the test suite in "watch mode"
-* `ember try:each` – Runs the test suite against multiple Ember versions
+* `pnpm test` – Runs the test suite on the current Ember version
+* `pnpm test:ember --server` – Runs the test suite in "watch mode"
+* `pnpm test:ember-compatibility` – Runs the test suite against multiple Ember versions
 
 ## Running the dummy application
 
-* `ember serve`
+* `pnpm start`
 * Visit the dummy application at [http://localhost:4200](http://localhost:4200).
 
 For more information on using ember-cli, visit [https://cli.emberjs.com/release/](https://cli.emberjs.com/release/).

README.md

@@ -15,8 +15,8 @@ This is an Ember addon that wraps the date picker [flatpickr](http://chmln.githu
 
 ## Compatibility
 
-* Ember.js v4.4 or above
-* Ember CLI v4.4 or above
+* Ember.js v4.8 or above
+* Ember CLI v4.8 or above
 * Node.js v18 or above
 
 ## Installation

ember-flatpickr/package.json

@@ -42,7 +42,7 @@
   "dependencies": {
     "@ember/render-modifiers": "^2.0.3",
     "@embroider/addon-shim": "^1.8.7",
-    "@ember/test-helpers": "~2.7.0"
+    "@ember/test-helpers": "~3.2.1"
   },
   "devDependencies": {
     "@babel/core": "^7.23.9",
@@ -73,7 +73,7 @@
     "webpack": "^5.90.1"
   },
   "peerDependencies": {
-    "ember-source": "^4.0.0 || ^5.0.0",
+    "ember-source": "^4.8.0 || ^5.0.0",
     "flatpickr": "^4.0.0"
   },
   "engines": {