Update dependency aiosmtplib to v3

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
aiosmtplib	^1.1.6 || ^2.0.0 -> ^1.1.6 || ^2.0.0 || ^3.0.0

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Release Notes

cole/aiosmtplib (aiosmtplib)

v3.0.0

Compare Source

• BREAKING: Drop Python 3.7 support.
• BREAKING: Positional arguments are now positional only, and keyword arguments
  are keyword only.
• BREAKING: Passing source_address as a string argument (deprecated in 2.0)
  is now an error. source_address takes a (addr, port) tuple that is used as
  the local_addr param of asyncio.create_connection, allowing for binding
  to a specific IP. The local_hostname argument takes the value to be sent to
  the server with the EHLO/HELO message (which is what source_address was used
  for prior to 2.0).
• Change: don't use timeout value passed to connect everywhere,
  only for the initial connection (credit @​wombatonfire)
• Change: removed unnecessary connection lost callback
• Change: revised handling for 'Future exception was never retrieved' warnings in
  protocol

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