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Bump django from 2.2.5 to 2.2.8

Bumps [django](https://github.com/django/django) from 2.2.5 to 2.2.8.
- [Release notes](https://github.com/django/django/releases)
- [Commits](https://github.com/django/django/compare/2.2.5...2.2.8

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sleep a bit more after a mail, to avoid smtplib.SMTPConnectError: (421, b'4.3.2 Connection rate limit exceeded.')