NuGet: System.Drawing.Common 5.0.0->4.6.1

Author: swharden

src/Spectrogram/Spectrogram.csproj

@@ -20,7 +20,7 @@ Release Notes: https://github.com/swharden/Spectrogram/releases</PackageReleaseN
 
   <ItemGroup>
     <PackageReference Include="FftSharp" Version="1.0.8" />
-    <PackageReference Include="System.Drawing.Common" Version="5.0.0" />
+    <PackageReference Include="System.Drawing.Common" Version="4.6.1" />
     <PackageReference Include="runtime.osx.10.10-x64.CoreCompat.System.Drawing" Version="5.8.64" Condition="'$([System.Runtime.InteropServices.RuntimeInformation]::IsOSPlatform($([System.Runtime.InteropServices.OSPlatform]::OSX)))' == 'true'" />
     <None Include="icon.png" Pack="true" PackagePath="\" />
     <None Include="README.md" Pack="true" PackagePath="\" />