chore(deps-dev): update rector/rector requirement from 0.15.5 to 0.15.7

Updates the requirements on [rector/rector](https://github.com/rectorphp/rector) to permit the latest version.
- [Release notes](https://github.com/rectorphp/rector/releases)
- [Commits](https://github.com/rectorphp/rector/compare/0.15.5...0.15.7)

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

Signed-off-by: dependabot[bot] <support@github.com>

composer.json

@@ -25,7 +25,7 @@
         "phpunit/phpcov": "^8.2",
         "phpunit/phpunit": "^9.1",
         "predis/predis": "^1.1 || ^2.0",
-        "rector/rector": "0.15.5",
+        "rector/rector": "0.15.7",
         "vimeo/psalm": "^5.0"
     },
     "suggest": {