Bump MimeKit from 2.15.1 to 3.4.1

[dependabot]

Bumps MimeKit from 2.15.1 to 3.4.1.

Changelog

Sourced from MimeKit's changelog.

MimeKit 3.4.1 (2022-09-12)

• Improved logic for reformatting headers when MimeMessage.WriteTo() is called with FormatOptions.International set to true.
• Fixed logic for quoting and/or encoding the MailboxAddress.Name in cases where the Name string contains quotes or parenthesis (especially when unicode characters are within the quotes or parenthesis).
• Improved logic in the address parser when it comes to unquoting mailbox names (i.o.w. unquote before decoding rather than after).
• Modified the Message-ID/Content-ID parser to be more lenient. (issue #835)

MimeKit 3.4.0 (2022-08-17)

• Introduced a new IPunycode interface and Punycode class allowing developers to override the default implementation that uses .NET's IdnMapping class. (issue #801)
• Added HtmlAttributeCollection Contains, IndexOf and TryGetValue methods.
• Dropped .NET5.0 support.
• Changed HtmlToHtml converter to avoid decoding character references. (issue #808)
• Fixed BoundStream to only seek in the base stream if seeking is supported.
• Added a new TextPart.TryDetectEncoding() API. (issue #804)
• Added support for message/feedback-report via a new MessageFeedbackReport class.
• Fixed a potential memory leak.
• When unquoting parameter values, don't convert tabs to spaces. (issue #809)
• Don't call Encoding.RegisterProvider() anymore. Rely on developers doing this themselves in their application startup logic.
• Remove System.Text.Encoding.CodePages dependency for net4x.
• Expose the LineNumber property on MimeMessageBeginEventArgs and MimeEntityBeginEventArgs. (issue #819)

MimeKit 3.3.0 (2022-06-11)

• Added Import() methods for X509Certificate2 for all S/MIME contexts. (issue #784)
• Handle S/MIME sha# as well as sha-# micalg names for improved interop. (issue #790)
• Fixed the MemoryBlockStream.Read() method to handle cases where the length of the stream is longer than int.MaxValue.
• Fixed TnefPart.ConvertToMessage() to promote lone multipart/mixed subparts to become the message body much like it used to work pre-v3.2.0. (issue #789)
• Reduced memory usage when using SecureMimeContext.Compress() and CompressAsync().
• Dropped support for net452 and net461 now that their life cycles have ended and are no longer supported by Microsoft. (issue #768)
• Added support for net462.

Special thanks to Fedir Klymenko for his improvements to MemoryBlockStream and SecureMimeContext.Compress!

... (truncated)

Commits

• 5f0b703 Bumped version to 3.4.1
• 28cbeb5 Added more rfc2047 decoder unit tests
• a63a5a9 Removed TestBase and fixed Benchmarks to register CodePages
• d12c596 Added another unit test for ParserOptions
• 1d46f17 Added more unit tests for ParserOptions
• b10c18f Crafted more date parser tests
• 3332d12 Added more date parser timezone tests
• 56ab585 Removed unnecessary checks in DateUtils parser and added another test
• 2de37e0 Added more unit tests for CharsetUtils
• 444534f Moved ValueStringBuilder into MimeKit.Utils namespace and added unit tests
• Additional commits viewable in compare view

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[dependabot]

Superseded by #147.