Udata-ckan

- Update constants imports from `.models` to `.constants` [250](https://github.com/opendatateam/udata-ckan/pull/250)

- Use `datetime.utcnow` to make sure to handle utc datetimes [246](https://github.com/opendatateam/udata-ckan/pull/246)
- Remove `valid_at` on deprecated GeoZones [248](https://github.com/opendatateam/udata-ckan/pull/248)

- Use id as remote_id ASAP for better error handling [239](https://github.com/opendatateam/udata-ckan/pull/239)
- Update mongoDB in CI [242](https://github.com/opendatateam/udata-ckan/pull/242)
- Refactor tests to mock CKAN results instead of starting a CKAN instance [245](https://github.com/opendatateam/udata-ckan/pull/245)
- Upgrade CKAN images used in docker-compose [244](https://github.com/opendatateam/udata-ckan/pull/244)
- Fix resource.published that is not needed anymore [243](https://github.com/opendatateam/udata-ckan/pull/243)

- :warning: **Breaking change** Use harvest dynamic field introduced in udata 5 [227](https://github.com/opendatateam/udata-ckan/pull/227)

- Replace mongo legacy image in CI [219](https://github.com/opendatateam/udata-ckan/pull/219)
- Make revision_id optional to match latest CKAN versions [220](https://github.com/opendatateam/udata-ckan/pull/220)

- Migrate to python3 🐍 [110](https://github.com/opendatateam/udata-ckan/pull/110)