roll: third_party/pigweed 67acdfa..2128983 (3 commits)

2128983:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/296892 pw_crypto: Implement ECDH for Mbed-TLS
da52e25:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/296832 pw_ide: Add manual testing guide
196813e:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/295394 docs: Temporarily remove changelog from search results

Rolled-Repo: https://pigweed.googlesource.com/pigweed/pigweed
Rolled-Commits: 67acdfa5f87ea6..21289833a0746b
Roll-Count: 1
Roller-URL: https://cr-buildbucket.appspot.com/build/8712488353272043313
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: If753c359c74a96ee7303daa379b5b7174a257354
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/examples/+/296993
Lint: Lint 🤖 <android-build-ayeaye@system.gserviceaccount.com>
Commit-Queue: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
diff --git a/third_party/pigweed b/third_party/pigweed
index 67acdfa..2128983 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 67acdfa5f87ea63500623f33375ce439764542d3
+Subproject commit 21289833a0746bc938bf25a84a21c29247c326a9