Upgrade CI database container to PostGIS 3.1
This ensures consistency with the production database and the dev architecture (https://gitlab.com/arkindex/architecture/-/commit/8913f4f5d03fb68e71bb12057322e3fe9788b8da).
Edited by Erwan Rouchet
This ensures consistency with the production database and the dev architecture (https://gitlab.com/arkindex/architecture/-/commit/8913f4f5d03fb68e71bb12057322e3fe9788b8da).