Add af-south-1 and eu-south-1 regions (AWS)

[moshevayner]

Fixes #9012

Just for clarification- the only changes I made were:

1. Update upup/pkg/fi/cloud.go to include the new regions (AWS global infra doc shows they have 3 AZs so I assumed they would be 1a/b/c)
2. Updated aws-sdk-go version to 1.30.6 in go.mod.

The rest of the changes are the result of running make gomod.

I ran make test and confirmed all the tests are passing.

[k8s-ci-robot]

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[moshevayner]

Not really sure why are the tests failing.
I just ran make nodeup examples test locally and confirmed that the exit code is 0.
Running on macOS 10.15.4. Not sure about the 1.13 version, though.
Would love to get some help on that please.

[hakman]

/ok-to-test

[hakman]

/lgtm

[rifelpet]

/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: MoShitrit, rifelpet

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