pw_env_setup: Stop pulling down Rust

Rust was only used by PyOxidizer which we're no longer supporting.

Change-Id: If7dc79e84de36a659977311ec2560e663bb0e61c
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/42901
Pigweed-Auto-Submit: Rob Mohr <mohrr@google.com>
Commit-Queue: Auto-Submit <auto-submit@pigweed.google.com.iam.gserviceaccount.com>
Reviewed-by: Keir Mierle <keir@google.com>

pw_env_setup/py/pw_env_setup/cipd_setup/pigweed.json

diff --git a/pw_env_setup/py/pw_env_setup/cipd_setup/pigweed.json b/pw_env_setup/py/pw_env_setup/cipd_setup/pigweed.json
index 043b9a9..0ed10b8 100644
--- a/pw_env_setup/py/pw_env_setup/cipd_setup/pigweed.json
+++ b/pw_env_setup/py/pw_env_setup/cipd_setup/pigweed.json
@@ -76,13 +76,6 @@
     ]
   },
   {
-    "_comment": "TODO(pwbug/69) Put rust in cipd for Windows.",
-    "path": "fuchsia/rust/${os=linux,mac}-${arch=amd64}",
-    "tags": [
-      "git_revision:027149919e36ce5645ca5d02d55b97ef52eb55ba"
-    ]
-  },
-  {
     "path": "pigweed/third_party/mingw64-x86_64-win32-seh/${os=windows}-${arch=amd64}",
     "tags": [
       "version:10.2.0-11"