Bump SixLabors.ImageSharp from 3.0.2 to 3.1.2 in /src (#2744)

Bumps [SixLabors.ImageSharp](https://github.com/SixLabors/ImageSharp) from 3.0.2 to 3.1.2.
- [Release notes](https://github.com/SixLabors/ImageSharp/releases)
- [Commits](SixLabors/ImageSharp@v3.0.2...v3.1.2)

---
updated-dependencies:
- dependency-name: SixLabors.ImageSharp
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

@@ -141,7 +141,7 @@
     <PackageReference Include="Pomelo.EntityFrameworkCore.MySql" Version="7.0.0" />
     <PackageReference Include="prometheus-net" Version="8.2.0" />
     <PackageReference Include="Quartz.Extensions.DependencyInjection" Version="3.8.0" />
-    <PackageReference Include="SixLabors.ImageSharp" Version="3.0.2" />
+    <PackageReference Include="SixLabors.ImageSharp" Version="3.1.2" />
     <PackageReference Include="System.Linq.Dynamic.Core" Version="1.3.7" />
     <PackageReference Include="EntityFrameworkCore.Exceptions.PostgreSQL" Version="6.0.3" />
   </ItemGroup>