Bump mysql-connector-java from 5.1.37 to 8.0.28 in /server

Bumps [mysql-connector-java](https://github.com/mysql/mysql-connector-j) from 5.1.37 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@5.1.37...8.0.28)

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

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

Author: dependabot[bot]

Diff for: server/pom.xml

@@ -27,7 +27,7 @@
 		<commons-collections.version>3.2.1</commons-collections.version>
 		<org.apache.httpcomponents.httpclient.version>4.5.1</org.apache.httpcomponents.httpclient.version>
 		<hibernate.version>5.0.2.Final</hibernate.version>
-		<mysql-connector-java.version>5.1.37</mysql-connector-java.version>
+		<mysql-connector-java.version>8.0.28</mysql-connector-java.version>
 		<org.owasp.esapi.version>2.5.0.0</org.owasp.esapi.version>
 		<org.owasp.dependency-check-maven.version>1.3.1</org.owasp.dependency-check-maven.version>
 		<spring-velocity-support.version>2.3</spring-velocity-support.version>