Kops - increase memory on kubetest2 jobs to 3Gi

[rifelpet]

Increasing to 3Gi seemed to work on the presubmit, so giving this a shot on the periodics now.

See https://prow.k8s.io/pr-history/?org=kubernetes&repo=kops&pr=10890

followup to #20930 and #20928

[dims]

/approve
/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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[k8s-ci-robot]

@rifelpet: Updated the job-config configmap in namespace default at cluster test-infra-trusted using the following files:

• key kops-periodics-distros.yaml using file config/jobs/kubernetes/kops/kops-periodics-distros.yaml
• key kops-periodics-grid.yaml using file config/jobs/kubernetes/kops/kops-periodics-grid.yaml
• key kops-periodics-misc2.yaml using file config/jobs/kubernetes/kops/kops-periodics-misc2.yaml

In response to this:

Increasing to 3Gi seemed to work on the presubmit, so giving this a shot on the periodics now.

See https://prow.k8s.io/pr-history/?org=kubernetes&repo=kops&pr=10890

followup to #20930 and #20928

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