fix: 升级有安全漏洞的mysql驱动

backend/pom.xml

@@ -403,7 +403,7 @@
                     <dependency>
                         <groupId>mysql</groupId>
                         <artifactId>mysql-connector-java</artifactId>
-                        <version>8.0.16</version>
+                        <version>8.0.28</version>
                     </dependency>
                     <dependency>
                         <groupId>com.itfsw</groupId>