actions: update PHP versions

Author: dktapps

Diff for: .github/workflows/ci.yml

@@ -8,7 +8,7 @@ jobs:
     if: "!contains(github.event.head_commit.message, '[ci skip]')"
     strategy:
       matrix:
-        php: ['8.1', '8.2']
+        php: ['8.1', '8.2', '8.3']
     name: Tests (PHP ${{ matrix.php }})
     steps:
       - uses: actions/checkout@v4
@@ -79,7 +79,7 @@ jobs:
       - name: Setup PHP
         uses: shivammathur/[email protected]
         with:
-          php-version: 8.1
+          php-version: 8.2
           ini-values: xdebug.max_nesting_level=3000
           tools: php-cs-fixer:3
         env: