🐛 fix 当进行加密导出时，由于输出流未关闭导致的文件损坏异常

src/main/java/com/alibaba/excel/context/WriteContextImpl.java

@@ -488,14 +488,18 @@ public class WriteContextImpl implements WriteContext {
         Encryptor encryptor = new EncryptionInfo(EncryptionMode.standard).getEncryptor();
         encryptor.confirmPassword(writeWorkbookHolder.getPassword());
         OPCPackage opcPackage = null;
+        OutputStream outputStream = null;
         try {
             opcPackage = OPCPackage.open(file, PackageAccess.READ_WRITE);
-            OutputStream outputStream = encryptor.getDataStream(fileSystem);
+            outputStream = encryptor.getDataStream(fileSystem);
             opcPackage.save(outputStream);
         } finally {
             if (opcPackage != null) {
                 opcPackage.close();
             }
+            if (outputStream != null) {
+                outputStream.close();
+            }
         }
         return fileSystem;
     }