Update Aurora MySQL dumpling command (#6847)

[ti-chi-bot]

This is an automated cherry-pick of #6847

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[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• TomShawn

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[TomShawn]

/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

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Commit hash: 6dc7da6

[TomShawn]

/hold

[ti-chi-bot]

In response to a cherrypick label: new pull request created: #7017.

[ti-chi-bot]

In response to a cherrypick label: new pull request created: #7018.

[TomShawn]

Follow-up: cherry-pick this part of content to v5.0/v5.1 in docs.