Update iText 9.1.0

Author: clown

Libraries/Itext/Cube.Pdf.Itext.csproj

@@ -25,8 +25,8 @@
     </PropertyGroup>
     <ItemGroup>
         <ProjectReference Include="..\Core\Cube.Pdf.Core.csproj" />
-        <PackageReference Include="itext" Version="9.0.0" />
-        <PackageReference Include="itext.bouncy-castle-adapter" Version="9.0.0" />
+        <PackageReference Include="itext" Version="9.1.0" />
+        <PackageReference Include="itext.bouncy-castle-adapter" Version="9.1.0" />
     </ItemGroup>
     <ItemGroup>
         <None Include="..\..\Icon.png" Pack="true" PackagePath="images" />