[TASK] Duplicate composer update in docker-compose.yml

Minor flaw in test setup.

Resolves: #99481
Related: #98628
Releases: main
Change-Id: Ia16af545251110938c9e08370d61cd70daeeafd3
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/77279
Reviewed-by: Stefan Bürk <stefan@buerk.tech>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Stefan Bürk <stefan@buerk.tech>

Build/testing-docker/local/docker-compose.yml

@@ -769,7 +769,6 @@ services:
         fi
         composer config platform.php ${PHP_VERSION}.0;
         composer update --prefer-lowest --no-progress --no-interaction;
-        composer update --prefer-lowest --no-progress --no-interaction;
         composer dumpautoload;
       "