fix: add --api-key and --timeout 600 to dotnet nuget push

[Copilot]

GitHub Packages push was warning about a missing API key despite GITHUB_TOKEN being available, and LVGLSharp.Native (which bundles 6 platform native libs) was consistently timing out at the default 300 s limit.

Changes

• --api-key "$GITHUB_TOKEN" added explicitly to the GitHub Packages dotnet nuget push invocation — the credential must be passed on the CLI even when it is already registered in the source config
• --timeout 600 added to both the GitHub Packages and NuGet.org push steps to accommodate the large LVGLSharp.Native package

dotnet nuget push nupkgs/*.nupkg \
  --source github \
  --api-key "$GITHUB_TOKEN" \
  --skip-duplicate \
  --timeout 600

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[Copilot]

Pull request overview

Updates the NuGet publish workflow to make package pushes more reliable for GitHub Packages and large packages (notably LVGLSharp.Native) by explicitly providing an API key and extending push timeouts.

Changes:

• Add --timeout 600 to dotnet nuget push for both NuGet.org and GitHub Packages publishing steps.
• Add explicit --api-key "$GITHUB_TOKEN" to the GitHub Packages dotnet nuget push invocation.