Fix root CI failures caused by composer.json normalization drift

[Copilot]

Root CI was failing in the main package jobs because composer_normalize was reordering composer.json. This change restores normalized dependency ordering without removing the sebastian/diff compatibility constraint added for the Fractor toolchain.

• CI failure source

  • Align composer.json with the order expected by ergebnis/composer-normalize
  • Remove the normalization diff that was failing root grumphp runs across PHP versions

• Dependency compatibility

  • Keep the sebastian/diff constraint limited to supported majors for the current Fractor stack
  • Avoid changing the actual compatibility intent while fixing the metadata/layout issue

"rector/rector": "^2.2.10",
"sebastian/diff": "^4.0 || ^5.0 || ^6.0 || ^7.0 || ^8.0",
"squizlabs/php_codesniffer": "^4.0.1"