remove GIT_ACCESS_TOKEN from commented code

gitlab/prepare.sh

 #!/usr/bin/env bash
 set -e
 . ./gitlab/configure_git.sh
-# git clone --depth 1 https://$service_name:${GIT_ACCESS_TOKEN}@code.schleswig-holstein.de/ozg-cloud/devops/build-management.git ## TODO: use this when MR is merged
+# git clone --depth 1 https://code.schleswig-holstein.de/ozg-cloud/devops/build-management.git ## TODO: use this when MR is merged
 #### TODO: remove code block when MR is merged
 git clone https://code.schleswig-holstein.de/ozg-cloud/devops/build-management.git
 cd build-management