Revert "fix: raise any memory limits in translations job"

This reverts commit 863bf05e.

This commit is not needed, as the variable is already set in global
context and job fails due to subprocess memory limit, not composer.

includes/translations.yml

 prepare translations:
   image: gitlab.wpdesk.dev:5050/wpdesk/docker-tests/php-box:8.3.1
-  variables:
-    COMPOSER_MEMORY_LIMIT: -1
   artifacts:
     name: "language"
     paths: