build(deps): bump Amazon.Lambda.Serialization.SystemTextJson

Bumps [Amazon.Lambda.Serialization.SystemTextJson](https://github.com/aws/aws-lambda-dotnet) from 2.0.1 to 2.3.0.
- [Release notes](https://github.com/aws/aws-lambda-dotnet/releases)
- [Changelog](https://github.com/aws/aws-lambda-dotnet/blob/master/RELEASE.CHANGELOG.md)
- [Commits](https://github.com/aws/aws-lambda-dotnet/commits)

---
updated-dependencies:
- dependency-name: Amazon.Lambda.Serialization.SystemTextJson
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

demo/functions/doc-pipe/save-on-s3/save-on-s3.csproj

@@ -9,7 +9,7 @@
 
   <ItemGroup>
     <PackageReference Include="Amazon.Lambda.Core" Version="1.1.0" />
-    <PackageReference Include="Amazon.Lambda.Serialization.SystemTextJson" Version="2.0.1" />
+    <PackageReference Include="Amazon.Lambda.Serialization.SystemTextJson" Version="2.3.0" />
   </ItemGroup>
 
 </Project>