Bump rector/rector from 0.17.13 to 0.18.4 (#1034)

Bumps [rector/rector](https://github.com/rectorphp/rector) from 0.17.13 to 0.18.4.
- [Release notes](https://github.com/rectorphp/rector/releases)
- [Commits](rectorphp/rector@0.17.13...0.18.4)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Jan Staněk <[email protected]>

composer.json

@@ -82,7 +82,7 @@
         "phpstan/phpstan-doctrine": "^1.3",
         "roave/security-advisories": "dev-master",
         "squizlabs/php_codesniffer": "^3.7",
-        "rector/rector": "^0.17"
+        "rector/rector": "^0.18"
     },
 
     "autoload": {