Bump gson from 2.8.5 to 2.8.9 in /elasticsearch7/elasticsearch7-sink#457

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dependabot/maven/elasticsearch7/elasticsearch7-sink/com.google.code.gson-gson-2.8.9DTStack/flinkStreamSQL:dependabot/maven/elasticsearch7/elasticsearch7-sink/com.google.code.gson-gson-2.8.9Copy head branch name to clipboard