修复订阅快照存储异常类型导入

src/main/java/lion/Service/SubscriptionSnapshotStore.java

@@ -13,6 +13,7 @@ import javax.crypto.Mac;
 import javax.crypto.spec.SecretKeySpec;
 import java.io.ByteArrayInputStream;
 import java.io.IOException;
+import java.io.UncheckedIOException;
 import java.nio.charset.StandardCharsets;
 import java.nio.file.*;
 import java.security.MessageDigest;