Bump mysql-connector-java from 8.0.25 to 8.0.28 (#598)

Bumps [mysql-connector-java](https://github.com/mysql/mysql-connector-j) from 8.0.25 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/8.0.25...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/pom.xml b/pom.xml
index 39464e9..910c1b1 100644
--- a/pom.xml
+++ b/pom.xml
@@ -252,7 +252,7 @@
         <opensaml.version>3.4.5</opensaml.version>
         <pac4j.version>4.5.2</pac4j.version>
         <postgresql.version>42.3.3</postgresql.version>
-        <mysql.version>8.0.25</mysql.version>
+        <mysql.version>8.0.28</mysql.version>
         <protobuf.version>3.16.1</protobuf.version>
         <rest-assured.version>4.3.3</rest-assured.version>
         <shiro.version>1.8.0</shiro.version>