asn1 fails to run in pytest

```
  File "/root/.cache/pypoetry/virtualenvs/progeny-backend-3b6oOu6H-py3.11/lib/python3.11/site-packages/asn1.py", line 317

    _re_oid = re.compile('^[0-9]+(\.[0-9]+)+$')
                         ^^^^^^^^^^^^^^^^^^^^^
SyntaxError: invalid escape sequence '\.'
```

More recent versions of asn1 fix the problem but Yoti only support the broken version