Zope.sendmail

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- Nothing changed yet.

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- Add implicit_tls option to the Mailer, if setted to True the SMTP connection will use smtplib.SMTP_SSL
and starts the connection with SSL from the beginning.
(see `RFC8314 <https://datatracker.ietf.org/doc/html/rfc8314#section-3.3>`_)

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- Fix SMTP protocol interoperability by avoiding hardcoded line endings.
(see https://www.rfc-editor.org/rfc/rfc2821#section-2.3.7)

- Add preliminary support for Python 3.13 as of 3.13a3.

- Add support for Python 3.12.

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- Drop support for Python 2.7, 3.5, 3.6.

- Add support for Python 3.11.

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- Add support for Python 3.10.

- Do not try to send queued emails to an empty address
(`45 <https://github.com/zopefoundation/zope.sendmail/issues/45>`_).

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- Add minimal savepoint support, so we do not fail if any code tries to create a savepoint.
(`35 <https://github.com/zopefoundation/zope.sendmail/issues/35>`_).

- Fix TypeError: 'error' object is not subscriptable during error handling on
Windows (`33 <https://github.com/zopefoundation/zope.sendmail/pull/33>`_).

- Add support for Python 3.9.