Set composer conflict to avoid installing phpunit 11.5.29 and 11.5.30
>>> [!note] Migrated issue
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<!-- Migrated from issue #3540622. -->
Reported by: [fjgarlin](https://www.drupal.org/user/2495842)
Related to !392
>>>
<h3 id="summary-problem-motivation">Problem/Motivation</h3>
<p>Once the upstream issue <a href="https://github.com/sebastianbergmann/phpunit/issues/6304">https://github.com/sebastianbergmann/phpunit/issues/6304</a> is fixed, we need to remove what was added here <a href="https://git.drupalcode.org/project/gitlab_templates/-/commit/0bb52ab67af624cf6d4de18ae3084faec1abfc73">https://git.drupalcode.org/project/gitlab_templates/-/commit/0bb52ab67af624cf6d4de18ae3084faec1abfc73</a> and test that the phpunit jobs complete.</p>
> Related issue: [Issue #3540591](https://www.drupal.org/node/3540591)
issue