[third_party/pigweed] Roll 2 commits

78951d3fbfb9617 pigweed.json: Exclude patches.json from formatting
94ba2a7415536f3 pw_presubmit: Allow dots in module part of commit

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 3149fcb78151518..78951d3fbfb9617
Roller-URL: https://ci.chromium.org/b/8768214580676762241
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I12e31a66f0ed268f88d629259dc078193f556301
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/174180
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 3149fcb..78951d3 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 3149fcb78151518d40108cf3d98eb8b7869bc04c
+Subproject commit 78951d3fbfb961732a9b63c41445794d58dad56f