Python error loading data

Tried to load data as described here

https://docs.geohealthcheck.org/en/latest/admin.html#load-data

Got this error

```
root@geohealthcheck:~/GeoHealthCheck# python3 GeoHealthCheck/models.py load tests/data/teste.json
Traceback (most recent call last):
File "/root/GeoHealthCheck/GeoHealthCheck/models.py", line 35, in
from itsdangerous import TimedJSONWebSignatureSerializer as Serializer
ImportError: cannot import name 'TimedJSONWebSignatureSerializer' from 'itsdangerous' (/usr/local/lib/python3.10/dist-packages/itsdangerous/__init__.py)
```

Ubuntu 22.04 with the latest GHC installed with docker-compose.

The traceback points to GeoHealthCheck/models.py line 35 while running `python3 GeoHealthCheck/models.py load tests/data/teste.json`; start by reproducing that command in the reported environment and checking the installed itsdangerous version. Done means the documented data-loading command works without this import error, with the behavior reflected in the installation or dependency guidance.

Scritto dal modello di indicizzazione a partire dal testo della issue.