Update drupal
Update drupal

Changes:

- https://github.com/docker-library/drupal/commit/3bdf3d6: Merge pull request https://github.com/docker-library/drupal/pull/178 from davidbarratt/composer-bin-path
- https://github.com/docker-library/drupal/commit/4e4d23e: Update Dockerfiles
- https://github.com/docker-library/drupal/commit/a792d2a: Add the composer bin folder to the PATH

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