chore(deps): update dependency mimekit to 4.16.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
MimeKit (source)	4.15.1 → 4.16.0

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Release Notes

jstedfast/MimeKit (MimeKit)

v4.16.0

Compare Source

• Simplified logic for illegal ctrl characters within quoted-string local-part tokens in addr-specs.
• Fixed IndexOutOfRangeException in ParseUtils.TryParseMsgId().
  (issue #​1227)
• Improved ParseException message for invalid ctrl chars in quoted-strings.
• Improved recovery logic for InternetAddressList.TryParse().
• Fixed leak in X509Certificate2Extensions.GetPrivateKeyAsAsymmetricKeyParameter().
  (issue #​1230)
• Fixed potential integer overflow in TnefPropertyReader.
  (issue #​1231)
• Added support for converting ECDsa PrivateKeys between Windows and BouncyCastle.
• Partial Encryption & Certificate Validation Failures for S/MIME.
  (issue #​1224)
• Fixed MimeParser/MimeReader.ScanContent to not init local until needed.
  (issue #​1234)
• Improved Received header folding logic.

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