composer(deps-dev): update orchestra/testbench requirement from ^8.1 || ^9.0 to ^9.4.0

---
updated-dependencies:
- dependency-name: orchestra/testbench
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

composer.json

@@ -38,7 +38,7 @@
         "dg/bypass-finals": "^1.4",
         "mikey179/vfsstream": "^1.6",
         "mockery/mockery": "^1.5",
-        "orchestra/testbench": "^8.1 || ^9.0",
+        "orchestra/testbench": "^9.4.0",
         "phpunit/phpunit": "^9.5.26 || ^10.5"
     },
     "minimum-stability": "dev",