chore(deps): update dependency mimekit to v4.4.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
MimeKit (source)	4.3.0 -> 4.4.0

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Release Notes

jstedfast/MimeKit (MimeKit)

v4.4.0

Compare Source

• Added net8.0 target.
• Improved folding logic for Disposition-Notification-Options header values.
  (issue #​979)
• Added interfaces for MimeMessage, MimeEntity, MimePart, Multipart, etc.
  (issue #​980)
• Fixed the FormatOptions.NewLineFormat setter logic.
• Modified AttachmentCollection.Add() for message/rfc822 attachments to better
  handle MimeParser exceptions.
  (issue #​1001)
• Bump BouncyCastle dependency to v2.3.0.
• Added support for ECC S/MIME certificates.
  (issue #​998)
• Improved Unix2Dos and Dos2Unix filters by fixing some corner cases exposed by new unit tests.
• Fixed MaxMimeDepth logic to still use MimePart subclasses when reached.
  (issue #​1006)

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