- Add a custom EmailStr type which lowercases the full e-mail, not just
the domain.
- Ensure EmailStr is used throughout wherever e-mails are used, both for
invites and user models
- Tests: update to check for lowercase email responses, e-mails returned
from APIs are always lowercase
- Tests: remove tests where '@' was ur-lencoded, should not be possible
since POSTing JSON and no url-decoding is done/expected. E-mails should
have '@' present.
- Fixes#2083 where invites were rejected due to case differences
- CI: pin pymongo dependency due to latest releases update, update python used for CI
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