Add comment for version pin

Co-authored-by: JPVenson <ger-delta-07@hotmail.de>

Directory.Packages.props

@@ -69,6 +69,7 @@
     <PackageVersion Include="Serilog.Sinks.Graylog" Version="3.1.1" />
     <PackageVersion Include="SerilogAnalyzer" Version="0.15.0" />
     <PackageVersion Include="SharpFuzz" Version="2.2.0" />
+     <!-- Pinned to 3.116.1 because https://github.com/jellyfin/jellyfin/pull/14255 -->
     <PackageVersion Include="SkiaSharp" Version="3.116.1" />
     <PackageVersion Include="SkiaSharp.HarfBuzz" Version="3.116.1" />
     <PackageVersion Include="SkiaSharp.NativeAssets.Linux" Version="3.116.1" />