Net9

[codebytes]

This pull request includes updates to the .NET version and various package dependencies across multiple project files. Additionally, it introduces new features to the development container configuration and updates the setup script for Key Vault.

Key changes include:

Development Container Configuration:

• Updated the Docker image to use .NET 9.0 and added new features for Docker-in-Docker and PowerShell in .devcontainer/dotnet/devcontainer.json.
• Added onCreateCommand to install project templates and updated postStartCommand to trust HTTPS development certificates.

Project File Updates:

• Updated target framework to net9.0 and package versions to 9.0.2 across multiple project files including 00-basic-console-template/BasicConsoleSample.csproj, 01-console-configuration-json/ConsoleConfigurationJson.csproj, and others. [1] [2] [3] [4] [5] [6] [7] [8] [9] [10]
• Updated additional package references to their latest versions in 08-console-keyvault/ConsoleKeyvault.csproj.

Key Vault Setup Script:

• Added commands to assign the Key Vault Contributor role to the current user in 08-console-keyvault/setup.sh.