Bump mysql-connector-java from 5.1.47 to 8.0.28 in /04-provider-8081#8

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dependabot/maven/04-provider-8081/mysql-mysql-connector-java-8.0.28albusxing/spring-cloud-learn-showcase:dependabot/maven/04-provider-8081/mysql-mysql-connector-java-8.0.28Copy head branch name to clipboard