[third_party/pigweed] Roll 2 commits

b8ca618f12d19b0 pw_console: Pin prompt_toolkit to 3.0.19
61154dd1323e0db pw_env_setup: Upgrade protoc to 3.17.3

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: a0d6ab09f4f189a..b8ca618f12d19b0
Roller-URL: https://ci.chromium.org/b/8838349066046384849
Cq-Cl-Tag: roller-builder:pigweed-experimental-roller
Cq-Cl-Tag: roller-bid:8838349066046384849
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Ie804824d7d1e401e5219eda811fa491b98d1ea54
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/57841
Bot-Commit: Pigweed Integration Roller <pigweed-integration-roller@pigweed.google.com.iam.gserviceaccount.com>
Commit-Queue: Pigweed Integration Roller <pigweed-integration-roller@pigweed.google.com.iam.gserviceaccount.com>
diff --git a/third_party/pigweed b/third_party/pigweed
index a0d6ab0..b8ca618 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit a0d6ab09f4f189aae97a83414f03a2fb7bcf8a2b
+Subproject commit b8ca618f12d19b01c03c06168d2883f7e0a5c34f