Update mockery/mockery requirement from ^1.3 to ^1.6

Updates the requirements on [mockery/mockery](https://github.com/mockery/mockery) to permit the latest version.
- [Release notes](https://github.com/mockery/mockery/releases)
- [Changelog](https://github.com/mockery/mockery/blob/1.6.x/CHANGELOG.md)
- [Commits](mockery/mockery@1.3.0...1.6.12)

---
updated-dependencies:
- dependency-name: mockery/mockery
  dependency-type: direct:development
...

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

composer.json

@@ -28,7 +28,7 @@
         "phpunit/phpunit": "^9.5|^10.0",
         "squizlabs/php_codesniffer": "^2.5",
         "orchestra/testbench": "^4.18|^6.21|^8.0|^9.0",
-        "mockery/mockery": "^1.3"
+        "mockery/mockery": "^1.6"
     },
     "autoload": {
         "psr-4": {