Use stock composer version

Author: physikerwelt

Dockerfile

@@ -149,7 +149,7 @@ COPY --from=fetcher /SemanticDrilldown /var/www/html/extensions/SemanticDrilldow
 ################
 #  Composer    #
 ################
-FROM ghcr.io/mardi4nfdi/docker-composer:main as composer
+FROM composer as composer
 COPY --from=collector /var/www/html /var/www/html
 WORKDIR /var/www/html/
 COPY composer.local.json /var/www/html/composer.local.json