Client fails to pull on windows (when installed from pip)

When using the client on Windows outside of QGIS (e.g. installed through pip), it does not work correctly when trying to pull a new version that involves geodiff operations:

import mergin
client = mergin.MerginClient (login='john', password='topsecret')
client.download_project('john/project', 'C:/Data/Project')
# now do some modifications to a GeoPackage on the server
client.pull_project('C:/Data/Project')

It fails with the following traceback:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "C:\Users\XYZ\AppData\Roaming\Python\Python38\site-packages\mergin\client.py", line 546, in pull_project
    return pull_project_finalize(job)
  File "C:\Users\XYZ\AppData\Roaming\Python\Python38\site-packages\mergin\client_pull.py", line 553, in pull_project_finalize
    raise ClientError("Cannot patch basefile {}! Please try syncing again.".format(basefile))
mergin.common.ClientError: Cannot patch basefile C:\Data\Project\.mergin\test.gpkg! Please try syncing again.

It looks like the underlying issue is in geodiff as client-log.txt contains this error:

GEODIFF: Unable to enable sqlite3/gpkg extensions

Beginnen Sie mit client.py:546 und client_pull.py:553 und untersuchen Sie anschließend client-log.txt auf den GEODIFF-Erweiterungsfehler. Reproduzieren Sie den in der Issue beschriebenen pip-installierten Windows-Workflow und verfolgen Sie den GeoPackage-Pull-Schritt. Als abgeschlossen gilt die Aufgabe, wenn pull_project für ein geändertes GeoPackage ohne den gemeldeten ClientError abgeschlossen wird.