chore(deps): update dependency mailkit to v4.6.0

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
MailKit (source)	4.5.0 -> 4.6.0

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Release Notes

jstedfast/MailKit (MailKit)

### [`v4.6.0`](https://togithub.com/jstedfast/MailKit/blob/HEAD/ReleaseNotes.md#MailKit-460-2024-05-17) [Compare Source](https://togithub.com/jstedfast/MailKit/compare/4.5.0...4.6.0) - Swallow SMTP RSET exceptions. These obscure other Send/SendAsync exceptions. Fixes a regression introduced in 4.4.0. (issue [#​1748](https://togithub.com/jstedfast/MailKit/issues/1748)) - Fixed ImapUtils.FormatInternalDate() to properly handle negative timezone offsets with non-zero minutes. (issue [#​1743](https://togithub.com/jstedfast/MailKit/pull/1753)) - Bumped MimeKit dependency to 4.6.0.

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