Update rector/rector requirement from ^0.13.5 to ^0.15.16

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](rectorphp/rector@0.13.5...0.15.16)

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

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

composer.json

@@ -37,7 +37,7 @@
 		"qossmic/deptrac-shim": "^0.23.0",
 		"vimeo/psalm": "^4.23",
 		"symfony/filesystem": "^5.4",
-		"rector/rector": "^0.13.5"
+		"rector/rector": "^0.15.16"
 	},
 	"suggest": {
 		"ext-fileinfo": "Improves mime type detection for files"