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

[renovate]

This PR contains the following updates:

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

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Release Notes

jstedfast/MailKit (MailKit)

v4.4.0

Compare Source

• Added net8.0 targets
• Split more sync/async logic to reduce allocations made by async state machines when
  calling the synchronous public APIs instead of the async APIs.
  (issue #​1335)
• Fixed logic for formatting IMAP FETCH HEADER.FIELDS.NOT corner case that was exposed by newly
  added unit tests.
• Fixed SmtpClient to disconnect during Authenticate/Async on socket errors.
• Fixed SmtpClient's re-EHLO logic to disconnect on errors.
• Added workaround for Zoho IMAP servers returning MODSEQ -1.
  (issue #​1686)
• Added workaround for some IMAP servers that use () instead of NIL for an unset Content-Location header
  in the BODYSTRUCTURE response.
  (issue #​1700)
• Fixed an issue in the Socket.ConnectAsync logic that could result in unhandled exceptions on the
  async thread if the ConnectAsync was cancelled.
  (issue #​1703)
• Added work-around for Yandex IMAP GetBodyPart() response not including content.
  (issue #​1708)

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