Fix intermittent build error on ubuntu-arm CI

[yaakov-h]

MSBuild version 17.8.3+195e7f5a3 for .NET
  Determining projects to restore...
/usr/share/dotnet/sdk/[8](https://github.com/SteamRE/SteamKit/actions/runs/13104813455/job/36557858277#step:7:9).0.100/NuGet.targets(156,5): error : Entry point was not found. [/home/runner/work/SteamKit/SteamKit/Resources/ProtobufDumper/ProtobufDumper.sln]

Build FAILED.

/usr/share/dotnet/sdk/8.0.[10](https://github.com/SteamRE/SteamKit/actions/runs/13104813455/job/36557858277#step:7:11)0/NuGet.targets(156,5): error : Entry point was not found. [/home/runner/work/SteamKit/SteamKit/Resources/ProtobufDumper/ProtobufDumper.sln]
    0 Warning(s)
    1 Error(s)

Time Elapsed 00:00:00.68
Error: Process completed with exit code 1.