Update dependency com.mysql:mysql-connector-j to v8.4.0

Author: renovate[bot]

pom.xml

@@ -98,7 +98,7 @@
         <dependency>
             <groupId>com.mysql</groupId>
             <artifactId>mysql-connector-j</artifactId>
-            <version>8.2.0</version>
+            <version>8.4.0</version>
         </dependency>
         <dependency>
             <groupId>me.tongfei</groupId>