[roll third_party/pigweed] pw_env_setup: Remove cargo support

This was only used to get PyOxidizer for pw_env_setup distribution which
is no longer supported.

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/42900

third_party/pigweed Rolled-Commits: c2d5781a76268bf..cc9c0555775eabe
Roller-URL: https://ci.chromium.org/b/8848416694526153760
Cq-Cl-Tag: roller-builder:pigweed-sample-project-roller
Cq-Cl-Tag: roller-bid:8848416694526153760
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Icc38d975805bf92486adda0913bc83bc15df0bb9
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/sample_project/+/43321
Reviewed-by: 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 c2d5781..cc9c055 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit c2d5781a76268bfdc00b2f5232bf3e7c1129bf37
+Subproject commit cc9c0555775eabe8e31ddbfe626977d4c9a9722d