Update django-anymail to 10.1

[pyup-bot]

This PR updates django-anymail[mailgun] from 10.0 to 10.1.

Changelog

10.1

-----

*2023-07-31*

Features
~~~~~~~~

* **Inbound:** Improve `AnymailInboundMessage`'s handling of inline content:

* Rename `inline_attachments` to `content_id_map`, more accurately reflecting its function.
* Add new `inlines` property that provides a complete list of inline content,
 whether or not it includes a *Content-ID*. This is helpful for accessing
 inline images that appear directly in a *multipart/mixed* body, such as those
 created by the Apple Mail app.
* Rename `is_inline_attachment()` to just `is_inline()`.

The renamed items are still available, but deprecated, under their old names.
See `docs <http://anymail.dev/en/stable/inbound/#anymail.inbound.AnymailInboundMessage>`__.
(Thanks to `martinezleoml`_.)

* **Inbound:** `AnymailInboundMessage` now derives from Python's
`email.message.EmailMessage`, which provides improved compatibility with
email standards. (Thanks to `martinezleoml`_.)

* **Brevo (Sendinblue):** Sendinblue has rebranded to "Brevo." Change default
API endpoint to ``api.brevo.com``, and update docs to reflect new name. Anymail
still uses ``sendinblue`` in the backend name, for settings, etc., so there
should be no impact on your code. (Thanks to `sblondon`_.)

* **Brevo (Sendinblue):** Add support for inbound email. (See
`docs <https://anymail.dev/en/stable/esps/sendinblue/#sendinblue-inbound>`_.)

* **SendGrid:** Support multiple ``reply_to`` addresses.
(Thanks to `gdvalderrama`_ for pointing out the new API.)

Deprecations
~~~~~~~~~~~~

* **Inbound:** `AnymailInboundMessage.inline_attachments` and `.is_inline_attachment()`
have been renamed---see above.

Links

• PyPI: https://pypi.org/project/django-anymail
• Changelog: https://pyup.io/changelogs/django-anymail/