roll: third_party/pigweed: pw_stream: Disable mpsc_stream_test for Pi Pico

mpsc_stream_test crashes on the Raspberry Pi Pico. Temporarily disable
until we can investigate further.

Original-Bug: b/361369435
Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/231212

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 1706947f4ea6dda..972e2d48d807a8e
Roller-URL: https://ci.chromium.org/b/8738956167085833361
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I8803f74345cb0361491abc9644bde0a71d5b9ca1
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/231333
Commit-Queue: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Lint: Lint 🤖 <android-build-ayeaye@system.gserviceaccount.com>
diff --git a/third_party/pigweed b/third_party/pigweed
index 1706947..972e2d4 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 1706947f4ea6ddaeb7dd6312e8199a713aef0553
+Subproject commit 972e2d48d807a8eb7d97767ef9afc3f55890ccee