Update dependency MailKit to 4.16.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
MailKit (source)	4.14.1 → 4.16.0

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Release Notes

jstedfast/MailKit (MailKit)

v4.16.0

Compare Source

• SECURITY: Fixed protocol streams to reset internal buffers after upgrading to SSL/TLS.
• Dispose of the RandomNumberGenerator used in RC4.GenerateKey().
  (issue #​1989)
• Fixed calculation for number of needed bytes in SOCKS5 connect response.
  (issue #​1993)

v4.15.1

Compare Source

• SECURITY: Bumped MimeKit to 4.15.1 for a security fix that prevents mailbox addresses from being allowed
  to contain CRLF sequences which can be used to inject SMTP commands in the SmtpClient when it sends
  MAIL FROM or RCPT TO commands.

v4.15.0

Compare Source

• Default the SmtpClient/Pop3Client/ImapClient.SslProtocols to the ServicePointManager.SecurityProtocol
  value in .NET Framework (net4x). (issue #​1952)
• Added support for.NET 10.
• Marked IMailService.SslCipherAlgorithm, SslCipherStrength, SslHashAlgorithm, SslHashStrength,
  SslKeyExchangeAlgorithm, and SslKeyExchangeStrength as Obsolete in .NET 10 in favor of the
  IMailService.SslCipherSuite property (.NET 10 only).
• Bumped MimeKit dependency to 4.15.0.

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