feat: 🆕 update NPOI to 2.6

Author: chsword

Chsword.Excel2Object/Chsword.Excel2Object.csproj

@@ -5,7 +5,7 @@
 		<Nullable>annotations</Nullable>
 	</PropertyGroup>
 	<PropertyGroup>
-		<TargetFrameworks>netstandard2.0;net452</TargetFrameworks>
+		<TargetFrameworks>netstandard2.0;net472;net6.0;netstandard2.1</TargetFrameworks>
 		<GeneratePackageOnBuild>true</GeneratePackageOnBuild>
 		<Product>Chsword.Excel2Object Library</Product>
 		<Authors>Zou Jian</Authors>
@@ -23,7 +23,7 @@
 		<None Include="..\README.md" Pack="true" PackagePath="\" />
 	</ItemGroup>
 	<ItemGroup>
-		<PackageReference Include="NPOI" Version="2.5.6" />
+		<PackageReference Include="NPOI" Version="2.6.0" />
 		<PackageReference Include="System.ComponentModel.Annotations" Version="5.0.0" />
 		<PackageReference Include="System.Net.Http" Version="4.3.4" />
 	</ItemGroup>

Chsword.Excel2Object/ExcelExporter.cs

@@ -197,7 +197,7 @@ private static T Switch<T>(ExcelType excelType, Func<T> funcXlsHssf, Func<T> fun
     private static byte[] ToBytes(IWorkbook workbook)
     {
         using var output = new MemoryStream();
-        workbook.Write(output);
+        workbook.Write(output, true);
         var bytes = output.ToArray();
         return bytes;
     }