Bump mysql-connector-java from 5.1.24 to 8.0.16 in /spring-boot/sjdemo

Bumps [mysql-connector-java](https://github.com/mysql/mysql-connector-j) from 5.1.24 to 8.0.16.
- [Release notes](https://github.com/mysql/mysql-connector-j/releases)
- [Changelog](https://github.com/mysql/mysql-connector-j/blob/release/8.0/CHANGES)
- [Commits](mysql/mysql-connector-j@5.1.24...8.0.16)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

spring-boot/sjdemo/pom.xml

@@ -39,7 +39,7 @@
         <dependency>
             <groupId>mysql</groupId>
             <artifactId>mysql-connector-java</artifactId>
-            <version>5.1.24</version>
+            <version>8.0.16</version>
         </dependency>
         <dependency>
             <groupId>io.shardingsphere</groupId>