Bump MailKit from 4.15.0 to 4.16.0

---
updated-dependencies:
- dependency-name: MailKit
  dependency-version: 4.16.0
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

src/Devlord.Utilities.Mail/Devlord.Utilities.Mail.csproj

@@ -27,7 +27,7 @@
 
   <ItemGroup>
     <ProjectReference Include="..\Devlord.Utilities\Devlord.Utilities.csproj" />
-    <PackageReference Include="MailKit" Version="4.15.0" />
+    <PackageReference Include="MailKit" Version="4.16.0" />
   </ItemGroup>
 
 </Project>