Added support for PHP 8.3 to CI workflow (#95)

Author: Bilge

.github/workflows/ci.yml

@@ -8,12 +8,12 @@ jobs:
   tests:
     strategy:
       matrix:
-        include:
-          - operating-system: 'ubuntu-latest'
-            php-version: '8.1'
-
-          - operating-system: 'ubuntu-latest'
-            php-version: '8.2'
+        operating-system:
+          - ubuntu-latest
+        php-version:
+          - 8.1
+          - 8.2
+          - 8.3
 
     name: PHP ${{ matrix.php-version }} ${{ matrix.job-description }}