build(deps): bump mysql:mysql-connector-java from 8.0.25 to 8.0.28 in /java/springboot #9

Job	Run time
ci (mybatis-plus, false) / ci	1m 37s
ci (mybatis, true) / ci	1m 31s
ci (mysql-connector-java, true) / ci	1m 33s
ci (springboot, true) / ci	1m 42s
ci (spring-jdbc, true) / ci	1m 29s
ci (oceanbase-client, true) / ci	1m 38s
ci (testcontainers-java, false) / ci	1m 34s
	11m 4s

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