fix: Remove Infection during Docker release

[Wirone]

It's causing failures during Docker build:

 => [dist 4/6] COPY php-cs-fixer /fixer/php-cs-fixer                                                                                                                                                                                0.0s
------
 > [vendor 3/3] RUN composer install --prefer-dist --no-dev --optimize-autoloader --no-scripts:
[...]
1.875 Updating dependencies
1.886 Your requirements could not be resolved to an installable set of packages.
1.886 
1.886   Problem 1
1.886     - Root composer.json requires infection/infection ^0.27.11 -> satisfiable by infection/infection[0.27.11].
1.886     - infection/infection 0.27.11 requires php ^8.1 -> your php version (7.4.33) does not satisfy that requirement.
1.886 
1.886 Running update with --no-dev does not mean require-dev is ignored, it just means the packages will not be installed. If dev requirements are blocking the update you have to resolve those problems.
------
Dockerfile:28
--------------------
  26 |     COPY composer.json /fixer/composer.json
  27 |     WORKDIR /fixer
  28 | >>> RUN composer install --prefer-dist --no-dev --optimize-autoloader --no-scripts
  29 |     
  30 |     FROM base as dist
--------------------
ERROR: failed to solve: process "/bin/sh -c composer install --prefer-dist --no-dev --optimize-autoloader --no-scripts" did not complete successfully: exit code: 2

[coveralls]

coverage: 96.013%. remained the same
when pulling 6980ee6 on Wirone:codito/docker-infection
into 5aae628 on PHP-CS-Fixer:master.

[keradus]

should we have a job on PR that verifies if docker image is buildable and runnable, similar like we do with phar file?

[Wirone]

In general, I personally would like to change our CI and instead of preparing PHP runtimes using shivammathur/setup-php, I would build Docker images and run all QA jobs on them (dev jobs on dev images, Fixer on release-like image). Then we would always know it's buildable and in sync with local development. But yeah, for now the job in PR that checks if Docker builds would be enough and really nice to see.