Docs: remove deprecated variable for mysql binlog config

[marcosmarxm]

What

Variable expire_logs_days is deprecated in favor of binlog_expire_log_seconds

Source: https://dev.mysql.com/worklog/task/?id=10924
Discourse topic: https://discuss.airbyte.io/t/aws-aurora-mysql-serverless-v2-mysql-v-8-0-23-cdc-with-incremental-deduped-history-sync-error/1022/6

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