fix oauth2-proxy image repository

[koba1t]

Fix oauth2-proxy image repository

What this PR does / why we need it:

oauth2-proxy(used here) project change container image hosting repository.(oauth2-proxy/oauth2-proxy#464)
Please fix container image place on example resource.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I've read the CONTRIBUTION guide
• I have added tests to cover my changes.
• All new and existing tests passed.

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[k8s-ci-robot]

Hi @koba1t. Thanks for your PR.

I'm waiting for a kubernetes member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[koba1t]

/joke

[k8s-ci-robot]

@koba1t: Where do you take someone who has been injured in a Peek-a-boo accident? To the I.C.U.

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[koba1t]

/assign @bowei

[aledbf]

/ok-to-test

[aledbf]

/lgtm
/approve

[aledbf]

@koba1t thanks!

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: aledbf, koba1t

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