Update dependency MailKit to v4.6.0 (#940)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [MailKit](http://www.mimekit.net/)
([source](https://togithub.com/jstedfast/MailKit)) | `4.5.0` -> `4.6.0`
|
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|
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|
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|
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|

---

### Release Notes

<details>
<summary>jstedfast/MailKit (MailKit)</summary>

###
[`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
[#&#8203;1748](https://togithub.com/jstedfast/MailKit/issues/1748))
- Fixed ImapUtils.FormatInternalDate() to properly handle negative
timezone offsets with non-zero minutes.
(issue [#&#8203;1743](https://togithub.com/jstedfast/MailKit/pull/1753))
-   Bumped MimeKit dependency to 4.6.0.

</details>

---

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Orso.Arpa.Mail/Orso.Arpa.Mail.csproj

@@ -5,7 +5,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="MailKit" Version="4.5.0" />
+    <PackageReference Include="MailKit" Version="4.6.0" />
   </ItemGroup>
 
   <ItemGroup>