[third_party/pigweed] Roll 6 commits

64ac90b74d9e8c7 docs: Generate doxygen html output locally
03aef93f460f15c pw_libc: Include strncpy
fe3fd13e05aaec2 pw_bluetooth: Add emboss contributing section to d
f55c3650f6b2cca pw_presubmit: Skip gn_teensy_build on mac-arm64
59c46d828848519 pw_channel: Set closed bit on FAILED_PRECONDITION
1a0707ec7f1aaf7 pw_channel: Respect sibling closure

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: ff2cbf8c82c8a69..64ac90b74d9e8c7
Roller-URL: https://ci.chromium.org/b/8752451090205367889
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: If1ec1e690b1e6557f7cfe57b9a2905dd1641a4ee
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/199572
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 ff2cbf8..64ac90b 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit ff2cbf8c82c8a6901a63f2fc4e0cea273a2d6713
+Subproject commit 64ac90b74d9e8c702a878392f01b77dd0554ad0c