Update to newer gcb-docker-gcloud image with docker 19.03.5

[dims]

The older image had 18.x which does not support buildx

What type of PR is this?
/kind bug

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

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[k8s-ci-robot]

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[dims]

/ok-to-test

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[dims]

/assign @pohly @vitt-bagal
cc @namrata-ibm

[msau42]

/ok-to-test

[msau42]

/lgtm
/approve

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[APPROVALNOTIFIER] This PR is APPROVED

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

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