pin imagesharp dependency (#2909)

ErsatzTV.Infrastructure/ErsatzTV.Infrastructure.csproj

@@ -35,7 +35,7 @@
         <PackageReference Include="Refit.Xml" Version="10.1.6" />
         <PackageReference Include="RichTextKit.Stbear" Version="0.4.167.3" />
         <PackageReference Include="Scriban.Signed" Version="7.2.0" />
-        <PackageReference Include="SixLabors.ImageSharp" Version="3.1.12" />
+        <PackageReference Include="SixLabors.ImageSharp" Version="[3.1.12, 4)" />
         <PackageReference Include="SkiaSharp" Version="3.119.2" />
         <PackageReference Include="TagLibSharp" Version="2.3.0" />
         <PackageReference Include="TimeZoneConverter" Version="7.2.0" />