feat: remove ergebnis/composer-normalize

[Chris53897]

I want to test CI if is needed "ergebnis/composer-normalize" while it runs via docker gh actions

[dbu]

it seems to work. but we have some dev dependencies in composer.json require-dev so that people can run them locally, same with phpspec.

is there an issue with having normalize in the require-dev section?

[Chris53897]

Only deprecations in the testruns for PHP 8.4.
Example: https://github.com/php-http/message/actions/runs/11143029675/job/30967217820

I have created a PR.
localheinz/diff#72

But i thought maybe it is not needed anymore, as it runs via docker gh actions.