Update renovate.json

[CrystalChun]

Explicitly type out branch names to disable updates

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: CrystalChun

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[openshift-ci]

@CrystalChun: 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-ai-operator-ztp-capi	f6023a8	link	true	/test e2e-ai-operator-ztp-capi

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