Update jangregor/phpstan-prophecy requirement from ^1.0.2 to ^2.0.0

Updates the requirements on [jangregor/phpstan-prophecy](https://github.com/Jan0707/phpstan-prophecy) to permit the latest version.
- [Release notes](https://github.com/Jan0707/phpstan-prophecy/releases)
- [Changelog](https://github.com/Jan0707/phpstan-prophecy/blob/master/CHANGELOG.md)
- [Commits](Jan0707/phpstan-prophecy@1.0.2...2.0.0)

---
updated-dependencies:
- dependency-name: jangregor/phpstan-prophecy
  dependency-type: direct:development
...

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

composer.json

@@ -41,7 +41,7 @@
         "vlucas/phpdotenv": "^5.6"
     },
     "require-dev": {
-        "jangregor/phpstan-prophecy": "^1.0.2",
+        "jangregor/phpstan-prophecy": "^2.0.0",
         "phpspec/prophecy-phpunit": "^2.2",
         "phpstan/extension-installer": "^1.4.2",
         "phpunit/phpunit": "^9.6.17",