Update ArrowUtil.java (#53)

Fix bug

Author: oceanqdu

dataproxy-common/src/main/java/org/secretflow/dataproxy/common/utils/ArrowUtil.java

@@ -34,7 +34,7 @@ public static ArrowType parseKusciaColumnType(String type) {
             case "int16" -> Types.MinorType.SMALLINT.getType();
             case "int32" -> Types.MinorType.INT.getType();
             case "int64", "int" -> Types.MinorType.BIGINT.getType();
-            case "unit8" -> Types.MinorType.UINT1.getType();
+            case "uint8" -> Types.MinorType.UINT1.getType();
             case "uint16" -> Types.MinorType.UINT2.getType();
             case "uint32" -> Types.MinorType.UINT4.getType();
             case "uint64" -> Types.MinorType.UINT8.getType();