Bump MailKit from 4.9.0 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]

cloud/src/LrmCloud.Api/LrmCloud.Api.csproj

@@ -27,7 +27,7 @@
     <PackageReference Include="Serilog.Sinks.File" Version="6.0.0" />
     <PackageReference Include="Serilog.Enrichers.Environment" Version="3.0.1" />
     <PackageReference Include="Serilog.Enrichers.Thread" Version="4.0.0" />
-    <PackageReference Include="MailKit" Version="4.9.0" />
+    <PackageReference Include="MailKit" Version="4.16.0" />
     <PackageReference Include="Stripe.net" Version="45.14.0" />
   </ItemGroup>