env: add PHP8.3 to Github Actions.

Author: smeghead

.github/workflows/php.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        php-versions: ['8.0', '8.1', '8.2']
+        php-versions: ['8.0', '8.1', '8.2', '8.3']
     name: PHP ${{ matrix.php-versions }} Test
     steps:
     - uses: actions/checkout@v4