Fix DBinstance enableCloudwatchLogsExports updates

[gustavodiaz7722]

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Description of changes:

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[ack-prow]

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[ack-prow]

@gustavodiaz7722: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
rds-verify-code-gen	a6fea5a	link	false	/test rds-verify-code-gen

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