Update all non-major dependencies

See merge request dbp/middleware/dbp-api/api-server-template!4

Update dependency vimeo/psalm to v4.4.0

See merge request dbp/middleware/dbp-api/api-server-template!3

Update all non-major dependencies

See merge request dbp/middleware/dbp-api/api-server-template!1

See https://github.com/vimeo/psalm/issues/4961

So it doesn't default to the directory name and clashes with other
projects.

No need to duplicate this everywhere

We require php7.3 now

Ideally we should fail gracefully when they are not defined..

* Create the user in the image with the same UID than the host user.
  This makes it easier to share files between the host and the container.
* Install the PHP dependencies right away, so the user doesn't have to
  know anything about composer at the beginning.