Merge pull request #213 from zhoutaoo/dependabot/maven/demos/producer/mysql-mysql-connector-java-8.0.28

Bump mysql-connector-java from 8.0.16 to 8.0.28 in /demos/producer

Author: zhoutaoo

demos/producer/pom.xml

@@ -50,7 +50,7 @@
         <dependency>
             <groupId>mysql</groupId>
             <artifactId>mysql-connector-java</artifactId>
-            <version>8.0.16</version>
+            <version>8.0.28</version>
         </dependency>
         <dependency>
             <groupId>org.flywaydb</groupId>