[versioning] dotnet sdk lts

[viceice]

What would you like Renovate to be able to do?
we should add a dotnet sdk versioning to be able to only update to lts releases

• chore(deps): update dotnet docker tag to v5-- docker-renovate-full#306
• https://dotnet.microsoft.com/platform/support/policy/dotnet-core#cadence

Did you already have any implementation ideas?

sure, hopefully we find a json like file to reuse 🙃

[github-actions[bot]]

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