PB-1785: upgrade to psycopg 3.

Before this change we were using psycopg 2.9.10. This does not seem to be
designed to [work correctly with gevent](https://www.psycopg.org/docs/advanced.html#support-for-coroutine-libraries) "out of the box".
The [psycogreen](https://github.com/psycopg/psycogreen/) library was written to
resolve that problem but we don't seem to be using it at all.

Upgrading to [psycopg 3 allows proper integration with gevent](https://www.psycopg.org/psycopg3/docs/advanced/async.html#gevent-support) without psycogreen or other workaround.

This change upgrades service-stac from psycopg 2.9.10 to 3.2.9. This was done by
updating the Pipfile then running `pipenv install`. This also updated other
dependencies.

In local tests, I verified the `/checker` endpoint remains much more responsive
with this change when end-to-end tests are being run. Maximum measured latency
dropped from ~15 seconds to ~3 seconds.

Author: adk-swisstopo

Pipfile

@@ -28,7 +28,7 @@ pytest-xdist = "*"
 [packages]
 gevent = "~=25.5"
 gunicorn = "~=23.0"
-psycopg2-binary = "~=2.9"
+psycopg = {extras = ["binary"], version = "~=3.2"}
 numpy = "~=2.3"
 python-dotenv = "~=1.1"
 djangorestframework = "~=3.16"