Update dependency aiosmtplib to v5.1.2

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
aiosmtplib (changelog)	5.1.1 → 5.1.2

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Release Notes

cole/aiosmtplib (aiosmtplib)

v5.1.2

Compare Source

• Security: Discard any buffered server data before the STARTTLS handshake,
  preventing a response-injection attack where a man-in-the-middle pre-stages
  plaintext that would otherwise be read as part of the encrypted session.
  More details: GHSA-vxj7-4xrp-5vr4
• Bugfix: Corrected SMTPResponse __repr__ result
• Bugfix: Calling connect() on an already-connected client now raises
  SMTPException instead of deadlocking on the connection lock
• Feature: Poe command runner for dev tasks
• Bugfix: Timeout ignored during CRAM-MD5 verification
• Bugfix: Only parse EHLO response after validating success
• Bugfix: return None from extract_sender when address list is empty
• Bugfix: Enforce a maximum total response size, preventing unbounded memory
  use if a server streams data with no line ending or endless multiline
  continuation lines
• Bugfix: Use the invalid_response status code (-1) instead of 500 when a
  server response line exceeds the maximum length
• Bugfix: A read timeout now closes the connection instead of leaving it in a
  desynced state, where a late server response could be mispaired with a
  subsequent command
• Bugfix: Correctly parse old-style AUTH= extension advertisements; all
  advertised methods are now kept (e.g. both PLAIN and LOGIN from
  AUTH=PLAIN LOGIN)
• Bugfix: ESMTP extension lines with leading whitespace are no
  longer ignored

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