Setup .NET build dependencies

Version updated for timheuer/bootstrap-dotnet to version v2.

• This action is used across all versions by 58 repositories.

Go to the GitHub Marketplace to find the latest changes.

Release notes

This is a major version bump because there are some breaking changes in dependency graph of the actions used (namely switching to node20). Because of these changing to be clear this could be impactful.

Full Changelog: https://github.com/timheuer/bootstrap-dotnet/compare/v1...v2

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