roll: third_party/pigweed pw_multisink: Make Unsafe utils safer

Verify the iterator status is OK at every iteration in the
UnsafeForEachEntry* functions to avoid fatal checks. That way, the
example of using this at crash time to collect logs into a snapshot
doesn't trigger a nested crash.

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/358812
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Original-Revision: 96f4e8746c4c4fb1575dcebb1d60fb2561680d7e

Rolled-Repo: https://pigweed.googlesource.com/pigweed/pigweed
Rolled-Commits: f777c1bbe42667..96f4e8746c4c4f
Roll-Count: 1
Roller-URL: https://cr-buildbucket.appspot.com/build/8694098655585712401
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I075b6357c94f754bdc8bdf70def78d915ffe61b9
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/examples/+/359552
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
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diff --git a/third_party/pigweed b/third_party/pigweed
index f777c1b..96f4e87 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit f777c1bbe42667136fef8ed482d7877b61d30bd3
+Subproject commit 96f4e8746c4c4fb1575dcebb1d60fb2561680d7e