roll: third_party/pigweed: freertos: Add failed malloc hook to support lib

This allows for detecting out of memory errors when using freertos heap
implementation.

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/218380
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https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: a8bf99f2bf19e83..dc6f26bcbd2bda3
Roller-URL: https://ci.chromium.org/b/8744023082108826081
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I40ea7864ba2ebc20f40cfb42282102a1dbaedcc6
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/examples/+/218611
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Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Commit-Queue: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
diff --git a/third_party/pigweed b/third_party/pigweed
index a8bf99f..dc6f26b 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit a8bf99f2bf19e8383c6b4c1a1ca6f339953bc982
+Subproject commit dc6f26bcbd2bda378b50d05f79370b58349bb811