roll: third_party/pigweed: pw_console: Pass rpc completions to web_kernel

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/224311
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https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: ac64a18ef887e4b..8a4ae70355cd135
Roller-URL: https://ci.chromium.org/b/8741629942860765937
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Change-Id: Idec586ed75b8f3eba11fdd03bb94a450ee83c76e
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/225399
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diff --git a/third_party/pigweed b/third_party/pigweed
index ac64a18..8a4ae70 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit ac64a18ef887e4ba2387ed217aafa2dc45e201e0
+Subproject commit 8a4ae70355cd13506f59a237611b4f834cc41bf9