Update pgadmin docker version

[dkatzz]

Description

Please explain the changes you made here.

Checklist

General

• Added the correct label
• Assigned to a specific person or civiform/deployment-system
• Created tests which fail without the change (if possible)
• Performed manual testing (at a minimum run bin/setup without your changes and then bin/deploy with your changes to ensure your changes don't break existing deployments)
• Extended the README / documentation, if necessary

Instructions for manual testing

If instructions are needed for manual testing by reviewers, include them here.

Issue(s) this completes

Fixes #<issue_number>; Fixes #<issue_number>...