Wrong tag for postgresql image

[B3nBeng]

Hi,

The image specified for postgresql doesn't work, we have to specify tag "14" because the "latest" tag on the image "zulip-postgresql" is PostgreSQL 10 and not 14.

Cause the following error : "django.db.utils.NotSupportedError: PostgreSQL 11 or later is required (found 10.17)."

However, the best way to solve this problem is to update the "latest" tag.