refactor: 优化 batchUpdate 代码

Signed-off-by: ZhouXY108 <luquanlion@outlook.com>

src/main/java/xyz/zhouxy/jdbc/JdbcOperationSupport.java

@@ -255,13 +255,15 @@ class JdbcOperationSupport {
                         result.recordErrorBatch(batchIndex, updateCounts, e);
                         if (!quietly) {
                             result.interrupt();
-                            return result;
+                            break;
                         }
                     }
+                    finally {
                         stmt.clearBatch();
                         batchIndex++;
                     }
                 }
+            }
             return result;
         }
     }