Update phpspec/prophecy-phpunit requirement from ^2.2 to ^2.3

Updates the requirements on [phpspec/prophecy-phpunit](https://github.com/phpspec/prophecy-phpunit) to permit the latest version.
- [Release notes](https://github.com/phpspec/prophecy-phpunit/releases)
- [Changelog](https://github.com/phpspec/prophecy-phpunit/blob/master/CHANGES.md)
- [Commits](phpspec/prophecy-phpunit@v2.2.0...v2.3.0)

---
updated-dependencies:
- dependency-name: phpspec/prophecy-phpunit
  dependency-type: direct:development
...

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

composer.json

@@ -42,7 +42,7 @@
     },
     "require-dev": {
         "jangregor/phpstan-prophecy": "^1.0.2",
-        "phpspec/prophecy-phpunit": "^2.2",
+        "phpspec/prophecy-phpunit": "^2.3",
         "phpstan/extension-installer": "^1.4.2",
         "phpunit/phpunit": "^9.6.17",
         "squizlabs/php_codesniffer": "^3.10"