Pin vgi-rpc 0.20.4 — shared-memory request-batch fix
Requires vgi-rpc>=0.20.4, which fixes shm-transport request-batch resolution: a worker now resolves shm-routed (offset-only) request batches and caches the client-advertised segment for the connection's lifetime. This makes the integration suite's shared-memory lane pass for accumulate/* and table_buffering/* (previously Expected 1 row in request batch, got 0).
Also: the cross-language bool_in_union integration test now disables itself upstream via mode skip (an arch-dependent Haybarn/DuckDB Arrow serialization bug), so the CI harness drops its filename-based exclusion.
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