CI: Change Behat tests to PHP 8.2 and 8.3 for now (8.4 not yet supported)

Author: ywarnier

.github/workflows/behat.yml

@@ -11,7 +11,7 @@ jobs:
             fail-fast: false
             matrix:
                 operating-system: [ubuntu-latest]
-                php-versions: ['8.3', '8.4']
+                php-versions: ['8.2', '8.3']
         steps:
             - name: Checkout
               uses: actions/checkout@v4