do not test ember 4.12 in CI due to bug in @ember/string deprecation

Author: Gaurav0

.github/workflows/ci.yml

@@ -67,7 +67,7 @@ jobs:
           - ember-lts-3.28
           - ember-lts-4.4
           - ember-lts-4.8
-          - ember-lts-4.12
+          #- ember-lts-4.12 # fails due to bug: https://github.com/emberjs/ember.js/issues/20377
           - ember-lts-5.4
           - ember-lts-5.8
           - ember-release
@@ -91,13 +91,13 @@ jobs:
           - scenario: ember-lts-3.28
             browser: Firefox
             bootstrap: 5
-          - scenario: ember-lts-4.12
+          - scenario: ember-lts-4.8
             browser: Firefox
             bootstrap: 3
-          - scenario: ember-lts-4.12
+          - scenario: ember-lts-4.8
             browser: Firefox
             bootstrap: 4
-          - scenario: ember-lts-4.12
+          - scenario: ember-lts-4.8
             browser: Firefox
             bootstrap: 5
           - scenario: ember-lts-5.8