fix (composer.json): increase require-dev versions, enable phpcs, phpcs-fix and lint to work

[gesinn-it-ilm]

There are require-dev dependencies inside composer.json which versions are out of date and need to be updated with the latest versions:

• require-dev deps are: "mediawiki/mediawiki-codesniffer": "38.0.0", "mediawiki/minus-x": "1.1.1", "php-parallel-lint/php-console-highlighter": "0.5.0", "php-parallel-lint/php-parallel-lint": "1.3.1"

The composer.json file should be reorganised and updated in order to have all components working, including phpcs, phpcs-fix and lint which now do not work as expected within CI.

[gesinn-it-ilm]

This issue is now fixed and working as expected. Pull request created.