[roll pigweed] pw_build: Update Python build package to 0.8.0

Also switch the build_wheel python_action to run inside the GN build
venv.

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/107370

https://pigweed.googlesource.com/pigweed/pigweed
pigweed Rolled-Commits: 95755989386c54f..a3538880dd836b4
Roller-URL: https://ci.chromium.org/b/8805466655055485041
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Iac6399ac7e713cf005f27de86cd61f71e846cbdf
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/zephyr-integration/+/107347
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/pigweed b/pigweed
index 9575598..a353888 160000
--- a/pigweed
+++ b/pigweed
@@ -1 +1 @@
-Subproject commit 95755989386c54fbde5877e252077ebef93af2b6
+Subproject commit a3538880dd836b455d5878ba4e0606637478abde