Update .NET package dependencies to latest compatible versions and fix CI network tests#831

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Copilot wants to merge 3 commits intov12.0from

copilot/fix-68ad70a3-04b9-476d-b245-b7c67c864134

Commits on Sep 22, 2025

Initial plan
Copilot
committed
Update .NET package dependencies to latest compatible versions

Copilot
and
BenjaminMichaelis
committed
Fix Chapter05 network tests to handle DNS blocking and broader network exceptions

Copilot
and
BenjaminMichaelis
committed