Bump mysql-connector-java from 8.0.18 to 8.0.28 in /event-sourcing/lean-and-mean#23

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dependabot/maven/event-sourcing/lean-and-mean/mysql-mysql-connector-java-8.0.28holograph/examples:dependabot/maven/event-sourcing/lean-and-mean/mysql-mysql-connector-java-8.0.28Copy head branch name to clipboard