build(deps): bump django-anymail from 8.2 to 8.4

[dependabot]

Bumps django-anymail from 8.2 to 8.4.

Release notes

Sourced from django-anymail's releases.

v8.4

Changelog

v8.3

Changelog

Changelog

Sourced from django-anymail's changelog.

v8.4

2021-06-15

Features

* **Postal:** Add support for this self-hosted ESP
  (`docs <https://anymail.readthedocs.io/en/stable/esps/postal>`__).
  Thanks to `@tiltec`_ for researching, implementing, testing and
  documenting Postal support.
v8.3
2021-05-19
Fixes

* **Amazon SES:** Support receiving and tracking mail in non-default (or multiple)
  AWS regions. Anymail now always confirms an SNS subscription in the region where
  the SNS topic exists, which may be different from the boto3 default. (Thanks to
  `@mark-mishyn`_ for reporting this.)


Postmark: Fix two different errors when sending with a template but no merge

data. (Thanks to @kareemcoding_ and @Tobeyforce_ for reporting them.)


Postmark: Fix silent failure when sending with long metadata keys and some

other errors Postmark detects at send time. Report invalid 'cc' and 'bcc' addresses

detected at send time the same as 'to' recipients. (Thanks to @chrisgrande_ for

reporting the problem.)

</code></pre>

</blockquote>

</details>

<details>

<summary>Commits</summary>


<ul>

<li><a href="https://github.com/anymail/django-anymail/commit/26d2b5caa0fb12ea88d9da82f44944478e215ff6&quot;&gt;&lt;code&gt;26d2b5c&lt;/code&gt;&lt;/a> Release 8.4</li>

<li><a href="https://github.com/anymail/django-anymail/commit/d79c3c2c051d6ad1b4b4f9dcf7e9955676ecdb8d&quot;&gt;&lt;code&gt;d79c3c2&lt;/code&gt;&lt;/a> Automate release process</li>

<li><a href="https://github.com/anymail/django-anymail/commit/adc92f037b691d77a0725b96f75ef5ff34983a67&quot;&gt;&lt;code&gt;adc92f0&lt;/code&gt;&lt;/a> Tests: tox and mock cleanup</li>

<li><a href="https://github.com/anymail/django-anymail/commit/e90c10b5461cfb9e8b080f23edd451078823892f&quot;&gt;&lt;code&gt;e90c10b&lt;/code&gt;&lt;/a> Add Postal support</li>

<li><a href="https://github.com/anymail/django-anymail/commit/f831fe814a9f8e48836f72f145d7e6b9ac362192&quot;&gt;&lt;code&gt;f831fe8&lt;/code&gt;&lt;/a> Release 8.3</li>

<li><a href="https://github.com/anymail/django-anymail/commit/67bf5a5912e8aa3db5862cfe26ab2adf49940e8e&quot;&gt;&lt;code&gt;67bf5a5&lt;/code&gt;&lt;/a> CI: split lint, docs jobs</li>

<li><a href="https://github.com/anymail/django-anymail/commit/3a03b196b898ff59477a89b3b6671c81bf373a53&quot;&gt;&lt;code&gt;3a03b19&lt;/code&gt;&lt;/a> Tests: run Django 3.2 first</li>

<li><a href="https://github.com/anymail/django-anymail/commit/0a4a2cfd569f73c19623215b89ee36f27b9df47e&quot;&gt;&lt;code&gt;0a4a2cf&lt;/code&gt;&lt;/a> Docs: upgrade docs build tooling</li>

<li><a href="https://github.com/anymail/django-anymail/commit/44754c908e9372365b82a2e4875b18346fc32de9&quot;&gt;&lt;code&gt;44754c9&lt;/code&gt;&lt;/a> Postmark: fix silent failures for send-time validation errors</li>

<li><a href="https://github.com/anymail/django-anymail/commit/b1a4f9809a52295527ff188b7e8f73720f487337&quot;&gt;&lt;code&gt;b1a4f98&lt;/code&gt;&lt;/a> Amazon SES: confirm webhook subscriptions in SNS topic's own region (<a href="https://github-redirect.dependabot.com/anymail/django-anymail/issues/236&quot;&gt;#236&lt;/a&gt;)&lt;/li>

<li>Additional commits viewable in <a href="https://github.com/anymail/django-anymail/compare/v8.2...v8.4&quot;&gt;compare view</a></li>

</ul>

</details>
<br />



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[dependabot]

Superseded by #217.