chore: update appengine driver

Signed-off-by: Mark Sagi-Kazar <[email protected]>

Author: sagikazarmark

composer.json

@@ -24,7 +24,7 @@
         "php": ">=8.0"
     },
     "require-dev": {
-        "phpunit/phpunit": "^8.0 || ^9.0"
+        "phpunit/phpunit": "^9.5"
     },
     "autoload": {
         "psr-4": {