Increase vpc cidrs to allocate more ip's for large scale k8s clusters

[hakuna-matatah]

• Pods and nodes are not coming up due to insufficient IPs, so increasing CIDRs to accommodate this.

[k8s-ci-robot]

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hakman

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[hakman]

/ok-to-test

[johngmyers]

Perhaps larger subnets instead of more subnets?

[hakuna-matatah]

Perhaps larger subnets instead of more subnets?

This is max size of subnets we could have with our requirements i.e; /16.