fix: update mysql-connector-java version to 5.1.49 and fastjson version

to 1.2.79

Author: JLY2015

pom.xml

@@ -85,13 +85,13 @@
         <dependency>
             <groupId>com.alibaba</groupId>
             <artifactId>fastjson</artifactId>
-            <version>1.2.69_sec12</version>
+            <version>1.2.79</version>
         </dependency>
 
         <dependency>
             <groupId>mysql</groupId>
             <artifactId>mysql-connector-java</artifactId>
-            <version>8.0.16</version>
+            <version>5.1.49</version>
         </dependency>
 
         <dependency>