Update quay.io/brancz/kube-rbac-proxy Docker tag to v0.18.0

[renovate-bot]

This PR contains the following updates:

Package	Update	Change
quay.io/brancz/kube-rbac-proxy	minor	v0.17.1 -> v0.18.0

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[openshift-ci]

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[sonarcloud]

Quality Gate passed

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0 New issues
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0.0% Duplication on New Code

See analysis details on SonarCloud

[openshift-ci]

@renovate-bot: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/e2e-openshift-fips	4af0278	link	true	/test e2e-openshift-fips

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