Upgrade FftSharp 1.0.6 -> 1.0.8

possibly breaking change because spectrograms will be 1 pixel higher than before

Author: swharden

src/Spectrogram/Spectrogram.csproj

@@ -19,7 +19,7 @@ Releases: https://github.com/swharden/Spectrogram/releases</PackageReleaseNotes>
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="FftSharp" Version="1.0.6" />
+    <PackageReference Include="FftSharp" Version="1.0.8" />
     <PackageReference Include="System.Drawing.Common" Version="4.7.0" />
     <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'" />
   </ItemGroup>