remove php 8.4

Author: recca0120

.github/workflows/run-tests.yml

@@ -9,7 +9,7 @@ jobs:
     strategy:
       fail-fast: true
       matrix:
-        php: [ '7.4', '8.0', '8.1', '8.2', '8.3', '8.4' ]
+        php: [ '7.4', '8.0', '8.1', '8.2', '8.3' ]
 
     name: PHP ${{ matrix.php }}
     env: