[third_party/pigweed] Roll 2 commits

6d1555ddaa5bd6d pw_build: Fix Python Tree Tests
f6522afd39b8a19 pw_sync_stl: Extend CMake support

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: e35b4a1725d815a..6d1555ddaa5bd6d
Roller-URL: https://ci.chromium.org/b/8824479366656758001
Cq-Cl-Tag: roller-builder:pigweed-experimental-roller
Cq-Cl-Tag: roller-bid:8824479366656758001
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I6a214ab1f21b9e2eeb0bb5363bdbadb76dd3401d
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/79884
Bot-Commit: Pigweed Integration Roller <pigweed-integration-roller@pigweed.google.com.iam.gserviceaccount.com>
Commit-Queue: Pigweed Integration Roller <pigweed-integration-roller@pigweed.google.com.iam.gserviceaccount.com>
diff --git a/third_party/pigweed b/third_party/pigweed
index e35b4a1..6d1555d 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit e35b4a1725d815acfcfb8117893ee712cf6119cb
+Subproject commit 6d1555ddaa5bd6da49b80fbf4b46f88e82e52ebb