chore: update Xcode beta path in CI workflow

[robertherber]

Summary

• fix CI build on macOS by pointing beta job to new Xcode 26 beta 5 path

Testing

• bun run lint
• bun run test
• bun run typecheck

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https://chatgpt.com/codex/tasks/task_e_68a4933a7194832d96c295a8a48f1a80

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Latest commit: 022f21c

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commit: 022f21c