Bump mysql-connector-java in /modules/registry/registry-core

Bumps [mysql-connector-java](https://github.com/mysql/mysql-connector-j) from 5.1.34 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](https://github.com/mysql/mysql-connector-j/compare/5.1.34...8.0.28)

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

Signed-off-by: dependabot[bot] <support@github.com>
diff --git a/modules/registry/registry-core/pom.xml b/modules/registry/registry-core/pom.xml
index a5b7c2c..25ae19d 100644
--- a/modules/registry/registry-core/pom.xml
+++ b/modules/registry/registry-core/pom.xml
@@ -37,7 +37,7 @@
         <derby.version>10.11.1.1</derby.version>
         <surefire.version>2.18.1</surefire.version>
         <skipTests>false</skipTests>
-        <mysql.connector.version>5.1.34</mysql.connector.version>
+        <mysql.connector.version>8.0.28</mysql.connector.version>
     </properties>
 
     <dependencies>