Bump django-anymail from 8.4 to 8.6

[dependabot[bot]]

Bumps django-anymail from 8.4 to 8.6.

Release notes

Sourced from django-anymail's releases.

v8.6

Changelog

v8.5

Changelog

Changelog

Sourced from django-anymail's changelog.

v8.6 LTS

2022-05-15

This is an extended support release. Anymail v8.6 will receive security updates and fixes for any breaking ESP API changes through at least May, 2023.

Fixes

* **Mailgun and SendGrid inbound:** Work around a Django limitation that
  drops attachments with certain filenames. The missing attachments
  are now simply omitted from the resulting inbound message. (In earlier
  releases, they would cause a MultiValueDictKeyError in Anymail's
  inbound webhook.)
Anymail documentation now recommends using Mailgun's and SendGrid's "raw MIME"
inbound options, which avoid the problem and preserve all attachments.
See Mailgun inbound <https://anymail.readthedocs.io/en/stable/esps/mailgun/#mailgun-inbound>__
and SendGrid inbound <https://anymail.readthedocs.io/en/stable/esps/sendgrid/#sendgrid-inbound>__
for details. (Thanks to @erikdrums_ for reporting and helping investigate the problem.)
Other

• Mailgun: Document Mailgun's incorrect handling of display names containing both non-ASCII characters and punctuation. (Thanks to @Flexonze_ for spotting and reporting the issue, and to Mailgun's @b0d0nne11_ for investigating.)

• Mandrill: Document Mandrill's incorrect handling of non-ASCII attachment filenames. (Thanks to @Thorbenl_ for reporting the issue and following up with MailChimp.)

• Documentation (for all releases) is now hosted at anymail.dev (moved from anymail.info).

Deprecations

*  This will be the last Anymail release to support Django 2.0--2.2 and Python 3.5.
If these deprecations affect you and you cannot upgrade, set your requirements to
django-anymail~=8.6 (a "compatible release" specifier, equivalent to >=8.6,==8.*).
v8.5
2022-01-19
</tr></table>

... (truncated)

Commits

• ad08892 Release 8.6
• 2001b1c Update ESP list in PyPI description, keywords
• 09f21a5 Mailgun/SendGrid inbound: workaround Django filename issue
• 6a2e30b Docs: note Mailgun broken display name encoding
• 33af7c3 Docs: note Mandrill broken attachment filenames
• d22f03c Docs: update Mandrill info
• 4656b3d Readme: clarify intro; update ESP list; update docs links
• c7288b9 CI: Work around outdated pypy-3.8-v7.3.8 sqlite
• ddeb938 Mandrill: re-enable integration tests
• 41147b5 Mandrill: don't send unnecessary empty fields
• Additional commits viewable in compare view

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[dependabot[bot]]

Superseded by #92.