Update orchestra/testbench requirement from ^4.18|^6.21|^8.0 to ^6.41.0

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/v6.41.0/CHANGELOG-6.x.md)
- [Commits](https://github.com/orchestral/testbench/commits/v6.41.0)

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

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

composer.json

@@ -27,7 +27,7 @@
         "ext-curl": "*",
         "phpunit/phpunit": "^9.5",
         "squizlabs/php_codesniffer": "^2.5",
-        "orchestra/testbench": "^4.18|^6.21|^8.0",
+        "orchestra/testbench": "^6.41.0",
         "mockery/mockery": "^1.3"
     },
     "autoload": {