Upgrade imageSharp (#2488)

Author: kblok

lib/PuppeteerSharp.Tests/PuppeteerSharp.Tests.csproj

@@ -14,7 +14,7 @@
 		<PackageReference Include="NUnit" Version="3.13.3" />
 		<PackageReference Include="NUnit3TestAdapter" Version="4.5.0" />
 		<PackageReference Include="System.Net.Http" Version="4.3.4" />
-		<PackageReference Include="SixLabors.ImageSharp" Version="1.0.4" />
+		<PackageReference Include="SixLabors.ImageSharp" Version="3.1.3" />
 		<PackageReference Include="Microsoft.AspNetCore.Connections.Abstractions" Version="2.2.0" />
 		<PackageReference Include="Microsoft.Bcl.AsyncInterfaces" Version="7.0.0" />
 	</ItemGroup>