Upgrade pgAdmin Docker Image to v9.6

[stephdl]

Feature request

Please upgrade the pgAdmin Docker image to dpage/pgadmin4:9.6 as proposed in PR #26.

Why

• Ensures the latest security patches, bug fixes, and improvements from upstream.
• Maintains a secure and stable database management platform for all users.

Proposed solution

• Merge PR #26 to update the pgAdmin Docker image to the latest version.

Additional context

• Regular dependency upgrades are essential for best practices in containerized environments.

See also

• PR #26

[stephdl]

QA ghcr.io/nethserver/postgresql:1.0.12-dev.1

upgrade -> OK
direct install -> OK

[stephdl]

released https://github.com/NethServer/ns8-postgresql/releases/tag/1.0.12