Bump MailKit from 4.14.1 to 4.16.0 (#1075)

Updated [MailKit](https://github.com/jstedfast/MailKit) from 4.14.1 to
4.16.0.

<details>
<summary>Release notes</summary>

_Sourced from [MailKit's
releases](https://github.com/jstedfast/MailKit/releases)._

No release notes found for this version range.

Commits viewable in [compare
view](https://github.com/jstedfast/MailKit/commits).
</details>

Author: Toastbrot236

Refresh.Core/Refresh.Core.csproj

@@ -22,7 +22,7 @@
         <PackageReference Include="CommandLineParser" Version="2.9.1" />
         <PackageReference Include="Discord.Net.Webhook" Version="3.18.0" />
         <PackageReference Include="DnsClient" Version="1.8.0" />
-        <PackageReference Include="MailKit" Version="4.14.1" />
+        <PackageReference Include="MailKit" Version="4.16.0" />
         <PackageReference Include="NPTicket" Version="3.1.1" />
         <PackageReference Include="Pfim" Version="0.11.3" />
         <PackageReference Include="SharpZipLib" Version="1.4.2" />