[roll third_party/pigweed] pw_blob_store: Add missing include

This file uses uint32_t, but doesn't #include <cstdint>. For some
reason, this issue appears when migrating std::span to pw::span.

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/98100

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: b124b3107c56271..fd3ebed4472e839
Roller-URL: https://ci.chromium.org/b/8811354971064306769
Cq-Cl-Tag: roller-builder:pigweed-experimental-roller
Cq-Cl-Tag: roller-bid:8811354971064306769
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I1dd7009a7dfb20e462898710e905107fbd8bb183
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/98124
Commit-Queue: Pigweed Integration Roller <pigweed-integration-roller@pigweed.google.com.iam.gserviceaccount.com>
Bot-Commit: Pigweed Integration Roller <pigweed-integration-roller@pigweed.google.com.iam.gserviceaccount.com>
diff --git a/third_party/pigweed b/third_party/pigweed
index b124b31..fd3ebed 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit b124b3107c56271c01e3dd63d0bbb65729d8bada
+Subproject commit fd3ebed4472e839adc4cc6e30b0ab23d7db0a04e