[mce-2.10] OCPBUGS-80962: Bump google.golang.org/grpc to v1.79.3

[germanparente]

What this PR does / why we need it:

Fix CVE-2026-33186 openshift/hypershift multicluster-engine/hypershift-rhel9-operator: gRPC-Go: Authorization bypass due to improper HTTP/2 path validation [mce-2.10]

[openshift-ci-robot]

@germanparente: This pull request references Jira Issue OCPBUGS-80962, which is invalid:

• release note text must be set and not match the template OR release note type must be set to "Release Note Not Required". For more information you can reference the OpenShift Bug Process.
• expected Jira Issue OCPBUGS-80962 to depend on a bug targeting a version in 4.21.0, 4.21.z and in one of the following states: VERIFIED, RELEASE PENDING, CLOSED (ERRATA), CLOSED (CURRENT RELEASE), CLOSED (DONE), CLOSED (DONE-ERRATA), but no dependents were found

Comment /jira refresh to re-evaluate validity if changes to the Jira bug are made, or edit the title of this pull request to link to a different bug.

The bug has been updated to refer to the pull request using the external bug tracker.

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In response to this:

What this PR does / why we need it:

Fix CVE-2026-33186 openshift/hypershift multicluster-engine/hypershift-rhel9-operator: gRPC-Go: Authorization bypass due to improper HTTP/2 path validation [mce-2.10]

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[openshift-ci]

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[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: germanparente
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[germanparente]

4.21 tracker is missing and it has been requested to prodsec

[openshift-ci]

@germanparente: 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/verify	566c1c9	link	true	/test verify

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