chore(deps): update dependency mimekit to v4.5.0

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
MimeKit (source)	4.4.0 -> 4.5.0

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Release Notes

jstedfast/MimeKit (MimeKit)

### [`v4.5.0`](https://togithub.com/jstedfast/MimeKit/blob/HEAD/ReleaseNotes.md#MimeKit-450-2024-04-13) [Compare Source](https://togithub.com/jstedfast/MimeKit/compare/4.4.0...4.5.0) - Fixed MailboxAddress to not use punycode to encode or decode the local-part of an addr-spec. (issue [#​1012](https://togithub.com/jstedfast/MimeKit/issues/1012)) - Removed explicit refs to CompilerServices.Unsafe and Encoding.CodePages from net6.0/8.0. (issue [#​1013](https://togithub.com/jstedfast/MimeKit/issues/1013))

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