[TASK] Adapt CI to use v14+v15

Author: garvinhicking

.github/workflows/ci.yml

@@ -17,7 +17,7 @@ jobs:
       fail-fast: false
       max-parallel: 5
       matrix:
-        typo3: ['^13.4', '^14.3']
+        typo3: ['^14.3', '^15.0.x-dev']
         php: ['8.2', '8.3', '8.4', '8.5']
     services:
       mysql: