Bump gson from 2.8.6 to 2.8.9 in /flink-clickstream-consumer#3

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dependabot/maven/flink-clickstream-consumer/com.google.code.gson-gson-2.8.9aws-samples/msk-serverless-data-pipeline:dependabot/maven/flink-clickstream-consumer/com.google.code.gson-gson-2.8.9Copy head branch name to clipboard