build(deps-dev): update cakephp/debug_kit requirement in /app

Updates the requirements on [cakephp/debug_kit](https://github.com/cakephp/debug_kit) to permit the latest version.
- [Release notes](https://github.com/cakephp/debug_kit/releases)
- [Commits](https://github.com/cakephp/debug_kit/compare/2.2.0...4.7.1)

---
updated-dependencies:
- dependency-name: cakephp/debug_kit
  dependency-type: direct:development
...

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

app/composer.json

@@ -16,7 +16,7 @@
     "require-dev": {
         "phpunit/phpunit": "^8",
         "php-parallel-lint/php-parallel-lint": "^1.2",
-        "cakephp/debug_kit": "^2.2.0"
+        "cakephp/debug_kit": "^4.7.1"
     },
     "suggest": {
         "ext-posix": "For process info fetching",