[FEATURE] Target newer .NET runtimes

[bdovaz]

@madushans I am willing to create PR if you give me the go ahead.

Is your feature request related to a problem? Please describe.

I use the tool through CI and right now it requires that I have to install the .NET 6 runtime just for this tool (I am using .NET 7 and transitioning to .NET 8).

Describe the solution you'd like

The tool targets newer runtimes.

Describe alternatives you've considered

Install .NET 6 runtime.

[madushans]

Hello, yes please do. Put a PR against `dev' branch. I have a few small fixes planned for next version, including https://github.com/madushans/DependenSee/issues/39 and https://github.com/madushans/DependenSee/issues/32.

I'll add the fixes after you and can include all of it in the next release.

(And the docs update. Currently it says Requires .NET 6 Runtime but it should say "SDK" instead.)