Replace data.cquest.org downloads with carte.gouv.fr downloads

[FlxPo]

Motivation

data.cquest.org downloads for the ADMIN EXPRESS CARTO dataset sometimes fail (as they do today).
See #290 for a bug report.

Changes

This PR replaces the url of the dataset on data.cquest.org by the url of the same dataset on cartes.gouv.fr. This server is less likely to be down because cartes.gouv.fr is an official platform backed by the french government. The url might not be stable long term so we'll may have to cache the dataset on data.gouv.fr at some point.

AI-assisted contribution

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Checklist

• I have reviewed all code in this PR
• I understand the code and can maintain it
• I added or ran appropriate tests/checks for the changed behavior

[FlxPo]

The new url works but the dataset folder structure changed, I have to check locally. Also the download speed is pretty slow... We should probably switch to distributing our own versioned extract of this dataset (in parquet format), to speed things up.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 59.06%. Comparing base (3d1c109) to head (2f5ff0d).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #291   +/-   ##
=======================================
  Coverage   59.06%   59.06%           
=======================================
  Files         129      129           
  Lines        6738     6738           
=======================================
  Hits         3980     3980           
  Misses       2758     2758           

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