[roll third_party/pigweed] targets/rp2040: Update docs to add missing picotool dependency

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/210811
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https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 5d11e2666a40e4c..24001c6dc9f34a6
Roller-URL: https://ci.chromium.org/b/8747203986653813009
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I0ac8ae629bd87fc5fdcf82549a88169d5852d9bd
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/examples/+/211138
Commit-Queue: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
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diff --git a/third_party/pigweed b/third_party/pigweed
index 5d11e26..24001c6 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 5d11e2666a40e4c0f434b7df47e2150d01df4e03
+Subproject commit 24001c6dc9f34a6fdaeec5d07338b9a103b6477c