[TD-13365]<fix>: upgrade fastjson version (#10124)

src/connector/jdbc/pom.xml

@@ -45,7 +45,7 @@
         <dependency>
             <groupId>com.alibaba</groupId>
             <artifactId>fastjson</artifactId>
-            <version>1.2.76</version>
+            <version>1.2.79</version>
         </dependency>
         <dependency>
             <groupId>com.google.guava</groupId>

src/connector/jdbc/src/main/java/com/taosdata/jdbc/rs/RestfulResultSet.java

@@ -268,7 +268,7 @@ public class RestfulResultSet extends AbstractResultSet implements ResultSet {
 
                 if (precision == TimestampPrecision.MS) {
                     // ms timestamp: yyyy-MM-dd HH:mm:ss.SSS
-                    return row.getTimestamp(colIndex);
+                    return (Timestamp) row.getTimestamp(colIndex);
                 }
                 if (precision == TimestampPrecision.US) {
                     // us timestamp: yyyy-MM-dd HH:mm:ss.SSSSSS