Bump MailKit from 2.15.0 to 3.4.3

[dependabot]

Bumps MailKit from 2.15.0 to 3.4.3.

Changelog

Sourced from MailKit's changelog.

MailKit 3.4.3 (2022-11-25)

• Fixed potential memory leaks in Pop3Client.
• Reverted SMTP pipelining of the DATA command. (issue #1459)
• Fixed ImapFolder.Rename() to disallow renaming a folder to be a child of itself.
• Fixed SmtpStream.ReadResponse/Async() to handle buffers that do not contain a complete line. (issue #1467)

MailKit 3.4.2 (2022-10-24)

• Fixed fetching of MessageSummaryItems.PreviewText if the octet count of the message body is 0. (issue #1430)
• Modified ImapFolder.Search(SearchOptions.None, query) work the same as ImapFolder.Search(query). (issue #1437)
• Improved performance of SmtpClient by reducing memory allocations and pipelining the DATA command when the PIPELINING extension is available.
• Refactored sync and async SmtpClient APIs such that the synchronous APIs no longer call methods marked with async in order to reduce AsyncMethodBuilder state machines/allocations.
• Modified SmtpClient to only send the ORCPT argument to RCPT TO if NOTIFY is specified.
• Improved performance of Pop3Client by reducing memory allocations.
• Refactored sync and async Pop3Client APIs such that the synchronous APIs no longer call methods marked with async in order to reduce AsyncMethodBuilder state machines/allocations.
• Improved IMAP's BODY/BODYSTRUCTURE parser to be able to scan ahead multiple tokens in order to better handle syntactically incorrect responses in a more graceful way. (issue #1446)
• Improved IMAP's ENVELOPE parser to handle ("Microsoft Exchange Server" NIL NIL ".MISSING-HOST-NAME.") in a more graceful way. (issue #1451)

MailKit 3.4.1 (2022-09-12)

• Reverted the socket connection change to allow Socket.Connect() to do DNS lookups for us. Turns out, Socket.Connect() doesn't iterate over all returned IP addresses until it finds an IP address that it can successfully connect to for a given hostname which is what we need to do.

MailKit 3.4.0 (2022-09-05)

• Fixed a bug that caused ImapFolder.Fetch/FetchAsync to throw TaskCanceledException instead of allowing the correct exception to bubble up. (issue #1415)
• Simplified socket connection logic to allow Socket.Connect() to do DNS lookups for us.
• Updated common mail server SSL certificates.
• Dropped net5.0 support.

MailKit 3.3.0 (2022-06-11)

• Added work-around for IMAP BODYSTRUCTURE responses that have a NIL multipart body. (issue #1393)
• Considerably reduced memory overhead from compiler-generated async/await Tasks allocations in the IMAP implementation (mostly focused on FETCH commands/responses). (issue #1335)
• Optimized FETCH response processing for the common case where FETCH responses are returned in sorted order.

... (truncated)

Commits

• ebf47fe Bumped version to 3.4.3
• 2396873 updated SSL certificates
• 4c81fe0 bumped MimeKit dependency to 3.4.3
• 9eeb69f Fixed SmtpStream.ReadResponse/Async() to handle buffers that do not contain a...
• 1d5be39 Added SmtpClient unit test to allow testing multi-line SMTP responses that ar...
• e02b15d Don't allow renaming an ImapFolder to be a child of itself.
• 2e8bcda Bump NUnit.ConsoleRunner from 3.15.2 to 3.16.0
• 3d892d7 Bump NUnit3TestAdapter from 4.3.0 to 4.3.1
• 684556a Fix typo in FAQ.md
• fd97e97 Bump Microsoft.NET.Test.Sdk from 17.3.2 to 17.4.0
• Additional commits viewable in compare view

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