Bump django-anymail from 14.0 to 15.0

[dependabot]

Bumps django-anymail from 14.0 to 15.0.

Release notes

Sourced from django-anymail's releases.

v15.0

Changelog

Changelog

Sourced from django-anymail's changelog.

v15.0

2026-04-18

Breaking changes

* Require **Django 5.0 or later** and Python 3.10 or later.
  (Thanks to `@terencehonles`_.)
Features

* **Resend:** Add support for inbound email. (Thanks to `@btimby`_.)
Fixes

* **Inbound:** Convert carriage return and line feed characters in attachment
  filenames to spaces for ESPs that parse them from invalid headers (e.g.,
  Postmark). (Thanks to `@BHSPitMonkey`_ for reporting the issue and providing
  an example.)
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</details>
<details>
<summary>Commits</summary>

<ul>
<li><a href="https://github.com/anymail/django-anymail/commit/17acea06b9361c3cc4ab6d9678bd5aea45db80ff"><code>17acea0</code></a> Release 15.0</li>
<li><a href="https://github.com/anymail/django-anymail/commit/8ad9d6e7e463efb770e3440871a05f2be4249ddf"><code>8ad9d6e</code></a> Inbound: sanitize CRNL in ESP-parsed attachment filenames</li>
<li><a href="https://github.com/anymail/django-anymail/commit/a6339d6c65bed21bcfe28e3c7b9b4ada4a290263"><code>a6339d6</code></a> Upgrade actions versions</li>
<li><a href="https://github.com/anymail/django-anymail/commit/4626462d49512b0c423071a8a6fe43a9610ead8a"><code>4626462</code></a> Drop Django 4.x</li>
<li><a href="https://github.com/anymail/django-anymail/commit/2bcfd620d2f1fa6705a13ad8645aa25a4572fd08"><code>2bcfd62</code></a> Resend: Add inbound support</li>
<li><a href="https://github.com/anymail/django-anymail/commit/13a08718571ca853f04336e15c525a98dd6dc48a"><code>13a0871</code></a> Run pyupgrade</li>
<li><a href="https://github.com/anymail/django-anymail/commit/7bf7a1a42e7fe1dbc008d22dc6d03579e4523b34"><code>7bf7a1a</code></a> Drop Django 4.0--4.2, Python 3.8--3.9 support</li>
<li>See full diff in <a href="https://github.com/anymail/django-anymail/compare/v14.0...v15.0">compare view</a></li>
</ul>
</details>

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