After opening 3 PRs and 2 tickets upstream, here we go:

- Update to version 3.1.4+git20211017.7b5a8b8:
* feat: allow sending email directly via mailgun API as an option
* fix bug introduced in previous PR with password uploads
* fixed UTF BOM
* try U
* show available voter types
* remove link while figuring out error
* allow viewing a vote by full hash so we don't do quite as many DB queries.
* avoid double-creating users
* fix obvious errors
* Revert "Pulling updated benadida master branch (#6)" (#7)
* Pulling updated benadida master branch (#6)
* Revert "Update pull from benadida repository. (#3)" (#4)
* Update pull from benadida repository. (#3)
* Admin is extracted from ENV
- switch to python3
- update dependencies based on requirements.txt
- remove helios-pr217.diff (merged upstream)
- refresh helios-server-opensuse_auth.patch
- add helios-server-disable-anymail.patch - disable anymail in
settings.py (we don't need nor have a python3-django-anymail package)
- add pr337.patch - open voter_stream in rb (binary) mode
- add workaround for "select ... on update" in %check which isn't
supported by sqlite