[roll third_party/pigweed] pw_cpu_exception_cortex_m: Fix PSP unit test

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/210071
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https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 9d5fa2aef16857b..1f9748d17b29edc
Roller-URL: https://ci.chromium.org/b/8747839301907903345
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CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Ifa2cff8e1102595195537ddc64c533c477167c4b
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/examples/+/210092
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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 9d5fa2a..1f9748d 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 9d5fa2aef16857bd225a1bfad12c8d66a7ad648d
+Subproject commit 1f9748d17b29edc615bf79c8bbf9b02cf5c0abd5