fix: bump google.golang.org/grpc to v1.79.3 to address CVE-2026-33186

[weshayutin]

Summary

• Bumps google.golang.org/grpc from v1.77.0 to v1.79.3
• Fixes CVE-2026-33186 (CRITICAL): gRPC-Go Authorization bypass due to improper HTTP/2 path validation

This kopia binary is bundled in the oadp-mustgather-rhel9 image, which was flagged with this CRITICAL CVE in the trivy scan.

CVE Details

CVE	Severity	Library	Installed	Fixed
CVE-2026-33186	CRITICAL	google.golang.org/grpc	v1.77.0	v1.79.3

Reference: https://avd.aquasec.com/nvd/cve-2026-33186

Test plan

• Verify go.mod shows google.golang.org/grpc v1.79.3
• Verify trivy scan no longer reports CVE-2026-33186 for the kopia binary in oadp-mustgather

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✅ Snyk checks have passed. No issues have been found so far.

Status	Scan Engine	Critical	High	Medium	Low	Total (0)
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[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: kaovilai, mpryc, weshayutin

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• OWNERS [kaovilai,mpryc,weshayutin]

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[mpryc]

/lgtm