Remove the deprecated Docker « links » statement for phpmyadmin/phpldapadmin

[lakano]

Fixes #

Type (Highlight the corresponding type)

• Bugfix
• Feature
• Documentation
• Refactoring (e.g. Style updates, Test implementation, etc.)
• Other (please describe):

Checklist

• Code updated to current masters head
• Passes CI checks
• Is a part of an issue
• Tests added for the bugfix or newly implemented feature, describe below why if not
• Changelog is updated
• Documentation of code and features exists

Changes

• The statement « links » is deprecated since at least 5 or 6 years ago and seems useless is this specific development case ( https://docs.docker.com/network/links/ )

Other information

• This also permit to developers that uses podman rather than docker to work on this project, because podman doesn't support this very old deprecated statement ( Compose v2: Podman is unable to execute pods while running services via docker-compose containers/podman#11717 )