Bump minimum testbench to ^9.2

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: freekmurze

composer.json

@@ -31,7 +31,7 @@
     },
     "require-dev": {
         "ext-json": "*",
-        "orchestra/testbench": "^7.0|^8.0|^9.0|^10.0|^11.0",
+        "orchestra/testbench": "^7.0|^8.0|^9.2|^10.0|^11.0",
         "pestphp/pest": "^1.22|^2.34|^3.0|^4.0"
     },
     "autoload": {