Bump mysql-connector-java from 8.0.19 to 8.0.28 in /mysql-delta-plugins

Bumps [mysql-connector-java](https://github.com/mysql/mysql-connector-j) from 8.0.19 to 8.0.28.
- [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@8.0.19...8.0.28)

---
updated-dependencies:
- dependency-name: mysql:mysql-connector-java
  dependency-type: direct:development
...

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Author: dependabot[bot]

mysql-delta-plugins/pom.xml

@@ -53,7 +53,7 @@
     <dependency>
       <groupId>mysql</groupId>
       <artifactId>mysql-connector-java</artifactId>
-      <version>8.0.19</version>
+      <version>8.0.28</version>
       <scope>test</scope>
     </dependency>
   </dependencies>