ci: add PHP 8.3 to GitHub Actions matrix

Author: Oksana Mykulanynets

.github/workflows/ci.yml

@@ -10,7 +10,7 @@ jobs:
     name: PHP ${{ matrix.php }} - Doctrine ${{ matrix.doctrine }}
     strategy:
       matrix:
-        php: ['8.0', '8.1', '8.2']
+        php: ['8.0', '8.1', '8.2', '8.3']
         doctrine: ['2.11', '2.12', '2.13', '2.14']
     steps:
       - uses: actions/checkout@v3