Update aws-sdk to v1.29.11 to get IMDSv2 support

[msau42]

Is this a bug fix or adding new feature?
New feature

What is this PR about? / Why do we need it?
Update the SDK to get support for IMDSv2.

There potentially is a latency regression for IMDSv1: aws/aws-sdk-go#2972, but supposedly it has been fixed: aws/aws-sdk-go#3066.

In my testing I have not noticed any regression that would cause driver errors.

What testing is done?
Ran k8s external-storage e2es on a cluster with IMDSv1 (and no v2), and separately on a cluster with IMDSv2 (only) enabled.

[coveralls]

Pull Request Test Coverage Report for Build 1036

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 77.43%

---

Totals
Change from base Build 1031:	0.0%
Covered Lines:	1386
Relevant Lines:	1790

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💛 - Coveralls

[leakingtapan]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: leakingtapan, msau42

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[leakingtapan]

/retest

[leakingtapan]

/retest

[leakingtapan]

Done setting up docker in docker.
Activated service account credentials for: [pr-kubekins@kubernetes-jenkins-pull.iam.gserviceaccount.com]
+ make test-e2e-single-az
go get github.com/aws/aws-k8s-tester/e2e/tester/cmd/k8s-e2e-tester@master
go: k8s.io/kubernetes@v1.17.3 requires
	k8s.io/repo-infra@v0.0.1-alpha.1 requires
	github.com/golangci/golangci-lint@v1.18.0 requires
	github.com/sourcegraph/go-diff@v0.5.1 requires
	sourcegraph.com/sqs/pbtypes@v0.0.0-20180604144634-d3ebe8f20ae4: unrecognized import path "sourcegraph.com/sqs/pbtypes" (parse https://sourcegraph.com/sqs/pbtypes?go-get=1: no go-import meta tags (meta tag localhost:3080/sqs/pbtypes did not match import path sourcegraph.com/sqs/pbtypes))

[msau42]

@leakingtapan my pr did not modify github.com/aws/aws-k8s-tester/e2e/tester/cmd/k8s-e2e-tester dependency. Should we fix it to a specific version instead of picking up master?

[leakingtapan]

Same error happening in the other driver: kubernetes-sigs/aws-fsx-csi-driver#132

[leakingtapan]

Should be fixed by: #468

[leakingtapan]

/retest