Merge pull request #7431 from TechEmpower/dependabot/maven/frameworks/Java/rapidoid/mysql-mysql-connector-java-8.0.28

Bump mysql-connector-java from 8.0.18 to 8.0.28 in /frameworks/Java/rapidoid

frameworks/Java/rapidoid/pom.xml

@@ -23,7 +23,7 @@
 		<dependency>
 			<groupId>mysql</groupId>
 			<artifactId>mysql-connector-java</artifactId>
-			<version>8.0.18</version>
+			<version>8.0.28</version>
 		</dependency>
 		<dependency>
 			<groupId>org.postgresql</groupId>