[third_party/pigweed] Roll 2 commits

c7b556c471a4a76 pw_allocator: Use c++20-friendly pointer operation
054a779d9e184cd pw_allocator: Add missing includes

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 47e70a6099386fd..c7b556c471a4a76
Roller-URL: https://ci.chromium.org/b/8810727587407763921
Cq-Cl-Tag: roller-builder:pigweed-experimental-roller
Cq-Cl-Tag: roller-bid:8810727587407763921
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Iaf16aadc421b4dc3e80c4d95bf642ed77d4bd0b0
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/99040
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 47e70a6..c7b556c 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 47e70a6099386fd91aeee18754f52379755d8baf
+Subproject commit c7b556c471a4a76bda1b1f073392598dae043982