upgrade dependent nuget packages.

src/NPOI/NPOI.csproj

@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
     <TargetFramework>netstandard2.0</TargetFramework>
@@ -19,9 +19,9 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="SharpZipLib" Version="1.0.0-alpha2" />
+    <PackageReference Include="SharpZipLib" Version="1.0.0-rc1" />
-    <PackageReference Include="System.Text.Encoding.CodePages" Version="4.4.0" />
+    <PackageReference Include="System.Drawing.Common" Version="4.5.0" />
-    <PackageReference Include="ZKWeb.System.Drawing" Version="4.0.0" />
+    <PackageReference Include="System.Text.Encoding.CodePages" Version="4.5.0" />
   </ItemGroup>
 
 </Project>