[third_party/pigweed] Roll 3 commits

5e64e119af0a5d7 pw_toolchain: Add Bazel toolchain registration hel
6f8d8b1cedcd376 pw_bluetooth_sapphire: Use pw_fuzzer_group
e002e507dd1b9d4 pw_multibuf: Remove unused GN dep

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 4d128fea5db2a9e..5e64e119af0a5d7
Roller-URL: https://ci.chromium.org/b/8762971157670501025
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I4e0b68614a464261538e13e87ab914ecbcef50a3
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/183200
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Commit-Queue: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
diff --git a/third_party/pigweed b/third_party/pigweed
index 4d128fe..5e64e11 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 4d128fea5db2a9e3849b9c873bad1f03ca4e9cb6
+Subproject commit 5e64e119af0a5d7c8d0fe0466594772604597b21