drop support for ember 3.28

Author: Gaurav0

.github/workflows/ci.yml

@@ -65,7 +65,6 @@ jobs:
       fail-fast: true
       matrix:
         try-scenario:
-          - ember-lts-3.28
           - ember-lts-4.4
           - ember-lts-4.8
           - ember-lts-4.12
@@ -74,7 +73,6 @@ jobs:
           #- ember-release
           #- ember-beta
           #- ember-canary
-          - ember-classic
           #- embroider-safe
           #- embroider-optimized
 

config/ember-try.js

@@ -7,14 +7,6 @@ module.exports = async function () {
   return {
     useYarn: true,
     scenarios: [
-      {
-        name: 'ember-lts-3.28',
-        npm: {
-          devDependencies: {
-            'ember-source': '~3.28.0',
-          },
-        },
-      },
       {
         name: 'ember-lts-4.4',
         npm: {
@@ -79,24 +71,6 @@ module.exports = async function () {
           },
         },
       },
-      {
-        name: 'ember-classic',
-        env: {
-          EMBER_OPTIONAL_FEATURES: JSON.stringify({
-            'application-template-wrapper': true,
-            'default-async-observers': false,
-            'template-only-glimmer-components': false,
-          }),
-        },
-        npm: {
-          devDependencies: {
-            'ember-source': '~3.28.0',
-          },
-          ember: {
-            edition: 'classic',
-          },
-        },
-      },
       embroiderSafe(),
       embroiderOptimized(),
     ],