Bump AWSSDK.SecretsManager from 3.7.304.12 to 3.7.304.15 in /src

Bumps [AWSSDK.SecretsManager](https://github.com/aws/aws-sdk-net) from 3.7.304.12 to 3.7.304.15.
- [Changelog](https://github.com/aws/aws-sdk-net/blob/main/SDK.CHANGELOG.MD)
- [Commits](https://github.com/aws/aws-sdk-net/commits)

---
updated-dependencies:
- dependency-name: AWSSDK.SecretsManager
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

src/IoTHub.Portal.Infrastructure/IoTHub.Portal.Infrastructure.csproj

@@ -107,7 +107,7 @@
     <PackageReference Include="AWSSDK.IoT" Version="3.7.307.63" />
     <PackageReference Include="AWSSDK.IotData" Version="3.7.300.112" />
     <PackageReference Include="AWSSDK.S3" Version="3.7.310.8" />
-    <PackageReference Include="AWSSDK.SecretsManager" Version="3.7.304.12" />
+    <PackageReference Include="AWSSDK.SecretsManager" Version="3.7.304.16" />
     <PackageReference Include="Azure.Data.Tables" Version="12.8.3" />
     <PackageReference Include="Azure.Messaging.EventHubs" Version="5.11.3" />
     <PackageReference Include="Azure.Messaging.EventHubs.Processor" Version="5.11.3" />