composer(deps-dev): update orchestra/testbench requirement

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/6.x/CHANGELOG-6.x.md)
- [Commits](orchestral/testbench@v6.16.0...v6.17.0)

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

Author: dependabot[bot]

composer.json

@@ -31,7 +31,7 @@
         "dg/bypass-finals": "^1.3",
         "mikey179/vfsstream": "^1.6",
         "mockery/mockery": "^1.4",
-        "orchestra/testbench": "^6.16.0",
+        "orchestra/testbench": "^6.17.0",
         "phpunit/phpunit": "^9.5.4"
     },
     "config": {