pw_rpc: Add missing integration test dependencies Change-Id: Ia21be2677d98b2091e15ce67a225aa2ee8cf3c4f Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/56247 Pigweed-Auto-Submit: Wyatt Hepler <hepler@google.com> Reviewed-by: Keir Mierle <keir@google.com> Commit-Queue: Wyatt Hepler <hepler@google.com>
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