composer(deps-dev): Bump rector/rector from 0.15.25 to 0.16.0

Bumps [rector/rector](https://github.com/rectorphp/rector) from 0.15.25 to 0.16.0.
- [Release notes](https://github.com/rectorphp/rector/releases)
- [Commits](rectorphp/rector@0.15.25...0.16.0)

---
updated-dependencies:
- dependency-name: rector/rector
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

composer.json

@@ -32,7 +32,7 @@
     "ergebnis/php-cs-fixer-config": "^5.5.2",
     "fakerphp/faker": "^1.21.0",
     "psalm/plugin-phpunit": "~0.18.4",
-    "rector/rector": "~0.15.25",
+    "rector/rector": "~0.16.0",
     "vimeo/psalm": "^5.11.0"
   },
   "autoload": {