Upgraded to .NET 9 and the NuGet packages#16

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AKlaus wants to merge 2 commits intomainfrom feature/#15

+93-59

Commits on Dec 29, 2024

Upgraded to .NET 9 and the NuGet packages
Alex Klaus
committed

Commits on Dec 30, 2024

Attempt to move from NSwag to the standard OpenAPI + Swashbuckle
Alex Klaus
committed