Update orchestra/testbench requirement from ^7.11 to ^8.0

Updates the requirements on [orchestra/testbench](https://github.com/orchestral/testbench) to permit the latest version.
- [Release notes](https://github.com/orchestral/testbench/releases)
- [Changelog](https://github.com/orchestral/testbench/blob/develop/CHANGELOG-8.x.md)
- [Commits](orchestral/testbench@v7.11.0...v8.0.4)

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

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

Author: dependabot[bot]

composer.json

@@ -14,7 +14,7 @@
         "laravel/nova": "^4.0"
     },
     "require-dev": {
-        "orchestra/testbench": "^7.11",
+        "orchestra/testbench": "^8.0",
         "phpunit/phpunit": "^9.5"
     },
     "repositories": [