Test against php 8.3

Author: sergiy-petrov

.github/workflows/continuous-integration.yml

@@ -14,7 +14,7 @@ jobs:
     strategy:
       fail-fast: true
       matrix:
-        php: [8.1, 8.2]
+        php: [8.1, 8.2, 8.3]
         stability: [prefer-stable]
 
     name: PHP ${{ matrix.php }} - ${{ matrix.stability }}