Allow cross-compilation for Windows targets from Linux VS Code

[kennystrawnmusic]

With these changes, one would be able to use the following command to cross-compile Rubeus for a Windows target from a Linux dev machine running VS Code and the C# Dev Kit:

$ dotnet build ./Rubeus/Rubeus.csproj -c Release -f net48 -r win-x64
/usr/share/dotnet/sdk/9.0.110/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.EolTargetFrameworks.targets(32,5): warning NETSDK1138: 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.
/home/htb-ac-1424625/Desktop/Rubeus/Rubeus/Rubeus.csproj : warning NU1903: Package 'Microsoft.Windows.Compatibility' 6.0.0 has a known high severity vulnerability, https://github.com/advisories/GHSA-555c-2p6r-68mm
  Rubeus net48 succeeded with 1 warning(s) (0.2s) → Rubeus/bin/Release/net48/win-x64/Rubeus.exe
    /home/htb-ac-1424625/Desktop/Rubeus/Rubeus/Rubeus.csproj : warning NU1903: Package 'Microsoft.Windows.Compatibility' 6.0.0 has a known high severity vulnerability, https://github.com/advisories/GHSA-555c-2p6r-68mm

Build succeeded with 1 warning(s) in 0.3s