Update test worker image

[Jeffwan]

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[Jeffwan]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[Jeffwan]

@Jeffwan: The following test failed, say /retest to rerun all failed tests:

Test name	Commit	Details	Rerun command
jeffwan-tf-operator-presubmit	9f2ab59	link	/test jeffwan-tf-operator-presubmit

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