Bump MailKit from 4.2.0 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/Modules/SimplCommerce.Module.EmailSenderSmtp/SimplCommerce.Module.EmailSenderSmtp.csproj

@@ -2,7 +2,7 @@
 
   <ItemGroup>
     <ProjectReference Include="..\SimplCommerce.Module.Core\SimplCommerce.Module.Core.csproj" />
-    <PackageReference Include="MailKit" Version="4.2.0" />
+    <PackageReference Include="MailKit" Version="4.16.0" />
   </ItemGroup>
 
 </Project>