[roll third_party/pigweed] third_party/pico_sdk: Do not remove strict warnings

Changes the Pi Pico build files to apply flag exceptions rather than
completely removing all strict warnings.

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/120217

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 878f2906ee814b4..de28a3c954a312f
Roller-URL: https://ci.chromium.org/b/8796662731281398721
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Ie7409870298dcc4069dddcc65dd8456f8f994536
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/121050
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 878f290..de28a3c 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 878f2906ee814b44fc314050b81bcb49fa8a0ad7
+Subproject commit de28a3c954a312fd58513f5268c596b19adefa13