Update the target for NET 9.0 in /03-CoreGenerativeAITechniques/src/Vision-01MEAI-GitHubModels

[PabloNunes]

Issue with the target in .NET vs function used in demo:

App: /workspaces/Generative-AI-for-beginners-dotnet-workshop/03-CoreGenerativeAITechniques/src/Vision-01MEAI-GitHubModels/bin/Debug/net8.0/Vision-01MEAI-GitHubModels
Architecture: x64
Framework: 'Microsoft.NETCore.App', version '8.0.0' (x64)
.NET location: /usr/share/dotnet

The following frameworks were found:
  9.0.3 at [/usr/share/dotnet/shared/Microsoft.NETCore.App]

Plus, would recommend take care on string image = Path.Combine(Directory.GetCurrentDirectory(), "images", imageFileName); as seems it is detecting inside of the folder of the .cs instead of the overall \src\ folder.

Unhandled exception. System.IO.DirectoryNotFoundException: Could not find a part of the path '/workspaces/Generative-AI-for-beginners-dotnet-workshop/03-CoreGenerativeAITechniques/src/Vision-01MEAI-GitHubModels/images/running-shoes.jpg'.

[github-actions]

👋 Thanks for contributing @PabloNunes! We will review the issue and get back to you soon.

[elbruno]

Fixed on #117
Best!