ci: add 8.4 matrix

Author: leeqvip

.github/workflows/default.yml

@@ -19,7 +19,7 @@ jobs:
     strategy:
       fail-fast: true
       matrix:
-        php: [ 8.0, 8.1, 8.2, 8.3 ]
+        php: [ 8.0, 8.1, 8.2, 8.3, 8.4 ]
 
     name: PHP${{ matrix.php }}