Bump csi proxy client version to 1.2.1

[hajiler]

What type of PR is this?
/kind failing-test

What this PR does / why we need it:
Bumps csi proxy client version to 1.2.1. This will address flakiness in our windows testing.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

[k8s-ci-robot]

Hi @hajiler. Thanks for your PR.

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[tonyzhc]

/ok-to-test

[tonyzhc]

/lgtm
/approve

[sunnylovestiramisu]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hajiler, sunnylovestiramisu, tonyzhc

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[mauriciopoppe]

I think this PR won't change the flakiness given that the change that we want kubernetes-csi/csi-proxy#364 is part of the server side component, not the client side which is what this PR is changing.

The server side version is changed in the k/k codebase, let's wait for kubernetes/kubernetes#131146 to be merged and see https://testgrid.k8s.io/provider-gcp-compute-persistent-disk-csi-driver#ci-windows-2019-provider-gcp-compute-persistent-disk-csi-driver for results post-merge.