Bump actions/setup-dotnet from 4 to 6 - #3

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@v4, actions/upload-artifact@v4. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

Nullable value type may be null.

Nullable value type may be null.

Nullable value type may be null.

Nullable value type may be null.

The target framework 'net6.0-windows' is out of support and will not receive security updates in the future. Please refer to https://aka.ms/dotnet-core-support for more information about the support policy.

The target framework 'net6.0-windows' is out of support and will not receive security updates in the future. Please refer to https://aka.ms/dotnet-core-support for more information about the support policy.

The target framework 'net6.0-windows' is out of support and will not receive security updates in the future. Please refer to https://aka.ms/dotnet-core-support for more information about the support policy.

Nullable value type may be null.

Nullable value type may be null.

Nullable value type may be null.

Nullable value type may be null.

The target framework 'net6.0-windows' is out of support and will not receive security updates in the future. Please refer to https://aka.ms/dotnet-core-support for more information about the support policy.

Nullable value type may be null.

Nullable value type may be null.

Nullable value type may be null.

Nullable value type may be null.

The target framework 'net6.0-windows' is out of support and will not receive security updates in the future. Please refer to https://aka.ms/dotnet-core-support for more information about the support policy.