PHP 8.4 support

Author: GrahamCampbell

.github/workflows/tests.yml

@@ -8,21 +8,21 @@ on:
 jobs:
   tests:
     name: Test PHP ${{ matrix.php-version }} ${{ matrix.name }}
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
     strategy:
       fail-fast: false
       matrix:
-        php-version: ['8.1', '8.2', '8.3']
+        php-version: ['8.1', '8.2', '8.3', '8.4']
         composer-flags: ['']
         name: ['']
         include:
-          - php: 8.0
+          - php: '8.0'
             composer-flags: '--prefer-lowest'
             name: '(prefer lowest dependencies)'
 
     steps:
       - name: Checkout Code
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
       - name: Setup PHP
         uses: shivammathur/setup-php@v2