Test on PHP 8.3

Author: trowski

.github/workflows/ci.yml

@@ -15,6 +15,9 @@ jobs:
           - operating-system: 'ubuntu-latest'
             php-version: '8.2'
 
+          - operating-system: 'ubuntu-latest'
+            php-version: '8.3'
+
     name: PHP ${{ matrix.php-version }} ${{ matrix.job-description }}
 
     runs-on: ${{ matrix.operating-system }}