How to semi-automate composer updated using GitLab CI

.gitlab-ci.yml

stages:
  - update-dependencies
  - code-style
  - build
  - test
  - deploy

composer-update:
  stage: update-dependencies
  only:
    - schedules
  image: ${CI_DEPENDENCY_PROXY_GROUP_IMAGE_PREFIX}/composer:2.5.8
  script:
    - "composer update --no-ansi --no-interaction --no-scripts --no-install --no-audit
                       --no-progress --ignore-platform-req=ext-* 2>&1 | tee composer-out.txt"
    - composer bump
    - git config --global user.email "some.email@example.com"
    - git config --global user.name "Some Name"
    - git config --global --add safe.directory $CI_PROJECT_DIR
    - BRANCH_NAME="update-php-dpendencies-$(date '+%Y-%m-%d_%H-%M')"
    - git checkout -b $BRANCH_NAME
    - git add composer.json composer.lock
    - (echo "Automated PHP dependency upgrades $(date '+%Y-%m-%d')" ; echo "";) | tee commit-message.txt
    - | # extract list of updated packages and save to a file and a variable
      UPGRADED_PACKAGES=$(cat composer-out.txt | \
          sed -n '/^Writing lock file/ q; p' | \
          sed -n '/Updating dependencies/,$ p' | \
          sed '1 d' | tee -a commit-message.txt | \
          sed 's/$/\\n/'| tr -d '\n'); # convert to a single line for json
    - echo $UPGRADED_PACKAGES
    - git commit -F commit-message.txt
    - git push "https://${GITLAB_USER_LOGIN}:${GITLAB_ACCESS_TOKEN}@${CI_REPOSITORY_URL#*@}" "HEAD:$BRANCH_NAME"
    - |
      BODY="{
          \"id\": ${CI_PROJECT_ID},
          \"description\": \"${UPGRADED_PACKAGES}\",
          \"source_branch\": \"${BRANCH_NAME}\",
          \"target_branch\": \"master\",
          \"remove_source_branch\": true,
          \"title\": \"Automated PHP dependency upgrades $(date '+%Y-%m-%d')\"
      }";
    - |
      curl --fail --no-progress-meter -X POST "${CI_API_V4_URL}/projects/${CI_PROJECT_ID}/merge_requests" \
         --header "PRIVATE-TOKEN:${GITLAB_ACCESS_TOKEN}" \
         --header "Content-Type: application/json" \
         --data "${BODY}"

syntax-check:
  stage: code-style
  image: ${CI_DEPENDENCY_PROXY_GROUP_IMAGE_PREFIX}/php:8.0.21-cli-alpine
  except:
    - schedules
  script:
    - find . -type f -name '*.php' -print0 | xargs -0 -n1 -P4 php -l -n | (! grep -v "No syntax errors detected" )