chore(deps): update swoole/phpx dependency and add test environment

- Updated swoole/phpx from ~2.4.2 to ~2.4.3 in composer.json
- Added USE_ZEND_ALLOC=0 environment variable to static-closure-delayed-callback test
- Modified test file header to include --ENV section for memory allocation testing

composer.json

@@ -12,7 +12,7 @@
     "marcj/topsort": "^2.0",
     "symfony/var-dumper": "^8.0",
     "symfony/yaml": "^8.0",
-    "swoole/phpx": "~2.4.2",
+    "swoole/phpx": "~2.4.3",
     "ajaxray/ansikit": "^0.3.1"
   },
   "require-dev": {

tests/compiler/closure/static-closure-delayed-callback.phpt

@@ -1,5 +1,7 @@
 --TEST--
 static closure created in an instance method remains a valid delayed callback
+--ENV--
+USE_ZEND_ALLOC=0
 --FILE--
 <?php