[roll third_party/pigweed] pw_env_setup: Bump executing Python package

Version 2.0.0 was removed from pypi.org

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/183838

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 62bf533508b772f..a9c7bc1ca476c30
Roller-URL: https://ci.chromium.org/b/8762600771619548433
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I46008d9ea6eac4a78751e07dffe3a6badffe5806
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/183912
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 62bf533..a9c7bc1 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 62bf533508b772ffbf45adbad47c6d77882e5a03
+Subproject commit a9c7bc1ca476c30c9127b0bc0dd819c289768dba