Update dependency MailKit to 4.17.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
MailKit (source)	4.16.0 → 4.17.0

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Release Notes

jstedfast/MailKit (MailKit)

v4.17.0

Compare Source

• Updated nullability of ImapClient.Inbox (which will never return null).
  (issue #​1996)
• Fixed IMAP's logic for ACL, LISTRIGHTS, MYRIGHTS, QUOTAROOT, QUOTA,
  and METADATA response parsers to properly handle []'s in the folder name.
  (issue #​2002)
• Updated System.Threading.Tasks.Extensions to v4.6.3.
• Updated System.Formats.Asn1 to v10.0.0 (instead of 10.0.2) for .NET 10.
• Bumped MimeKit dependency to 4.17.0.
• Code quality improvements.

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