It was placed in mypy.plugins.django-stubs section so it was not
taken into account.

This ensures the deposit checks in the elastic infra (using azure objstorage) is
working. There is currently no way to prevent the content-encoding from being detected
and stored in the blobstorage (various tryouts have been tested to no avail). That
content-encoding, is then preventing the checking/reading to work (failing [2]).

Following the documentation, a workaround has been implemented to reset a posteriori the
content-encoding [1].

It's not proper but, from repl experimentation, it's working which is better than the
actual failure.

[1] https://learn.microsoft.com/en-us/azure/storage/blobs/storage-blob-properties-metadata-python

[2]
```
HttpResponseError: ('Received response with content-encoding: gzip, but failed to decode it.', error('Error -3 while decompressing data: incorrect header check'))
```

Refs. swh/infra/sysadm-environment#5129

Related to T2105