Update PesterTests and devcontainer to .NET 8

fflaten commented 5 months ago

PR Summary

.NET 6 is reaching EOL later this year. PR changes:

Updates devcontainer image to .NET 8 SDK. Adds extensions to improve pipelines/workflows DX
Updates PesterTests to .NET 8 runtime and latest dependencies
Updates CONTRIBUTING docs to require .NET 8 SDK
Ignores build warning about vulnerable PowerShell SDK dependency (<6.1.6), related #2207

.NET 8 SDK is already used for building in Azure Pipelines CI.

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[ ] Tests are added/update (if required)
[ ] Documentation is updated/added (if required)

nohwnd commented 5 months ago

/azp run

azure-pipelines[bot] commented 5 months ago

Azure Pipelines successfully started running 1 pipeline(s).

nohwnd commented 5 months ago

Partly addressed in #2432, I will merge the changes once it is in.