Alicloud: use Balance as MultiAZPolicy

[bittopaz]

This is part of #4127.

This is just a small change, but involves vendor upgrade.

By default, the new instances will first scale in the first subnet, only when there is not enough resources in that subnet(AZ), it will then scale new instances to another subnet.

By setting MultiAZPolicy to Balance, all the scaled instances in the scaling group will spread across all the subnets equally, which is much better for reliability.

MultiAZPolicy is only supported in the latest Alicloud SDK, so I also upgrade the SDK to latest version.

[k8s-ci-robot]

Hi @bittopaz. Thanks for your PR.

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[zetaab]

/ok-to-test

[zetaab]

/lgtm
/approve

@bittopaz please check that alicloud should work after these merged prs. I do not have possibility to verify that

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: bittopaz, zetaab

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[bittopaz]

@zetaab sure, I will verify it.

Thank you for your help.