[roll third_party/pigweed] targets: Fix pico_sdk elf2uf2 on Windows

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/170770

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: d2fc5bdf6c65b61..31df7bd5cc7955d
Roller-URL: https://ci.chromium.org/b/8770050522316579137
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I052c1499edb06e485f0eb0d91762b50845a6669e
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/170815
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 d2fc5bd..31df7bd 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit d2fc5bdf6c65b61ea48056b4573a8585aff40955
+Subproject commit 31df7bd5cc7955d687f90ab7e2ca6b87194d8f1e