Update phan/phan requirement from 4.0.* to 4.0.* || 5.3.*

Updates the requirements on [phan/phan](https://github.com/phan/phan) to permit the latest version.
- [Release notes](https://github.com/phan/phan/releases)
- [Changelog](https://github.com/phan/phan/blob/v5/NEWS.md)
- [Commits](phan/phan@4.0.0...5.3.0)

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

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

composer.json

@@ -18,7 +18,7 @@
         "jakub-onderka/php-console-highlighter": "^0.4",
         "jakub-onderka/php-parallel-lint": "^1.0",
         "mockery/mockery": "^1.2",
-        "phan/phan": "4.0.*",
+        "phan/phan": "4.0.* || 5.3.*",
         "php-coveralls/php-coveralls": "^2.4",
         "phpmd/phpmd": "^2.6",
         "phpstan/phpstan": "^0.12",