[pgadmin-org/pgadmin4] 5a26ca: Use PG16 as the default in the container.

[Dave Page]

  Branch: refs/heads/master
  Home:   https://github.com/pgadmin-org/pgadmin4
  Commit: 5a26cad588260b8abeaa56a83b8fd17a0abbc6a6
      
https://github.com/pgadmin-org/pgadmin4/commit/5a26cad588260b8abeaa56a83b8fd17a0abbc6a6
  Author: Dave Page <dp...@pgadmin.org>
  Date:   2023-09-21 (Thu, 21 Sep 2023)

  Changed paths:
    M Dockerfile
    M docs/en_US/release_notes.rst
    A docs/en_US/release_notes_7_8.rst

  Log Message:
  -----------
  Use PG16 as the default in the container.