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Fix remaining macOS bash 3.2 portability issues in update script (step 5)

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copilot-swe-agent[bot] committed
0f3c9ab483ac58f437a7329544d8a06d9ca346ba
Parent: 8170c20
Committed by GitHub <noreply@github.com> on 5/21/2026, 12:07:45 PM