HYPERFLEET-927 - fix: bump gRPC to v1.79.3 (CVE-2026-33186) + advisory lock race fix

[rafabene]

Summary

Cherry-picks for z-stream release 0.2.1:

• HYPERFLEET-927/HYPERFLEET-762: Bump google.golang.org/grpc to v1.79.3 to fix CVE-2026-33186 (minimal dependency bump, no OpenTelemetry refactor)
• HYPERFLEET-875: Fix advisory lock race condition with transactions

Test plan

• make verify-all passes (721 unit tests)
• Integration tests
• E2E tests on release-0.2 branch

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