pw_env_setup: Switch to 3pp protoc

There's an arm64 build for this protoc.

See also https://github.com/project-chip/connectedhomeip/issues/4366

Change-Id: Idf89015e2d2e8683ac67daffcd748aa8edb77dac
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/29489
Pigweed-Auto-Submit: Rob Mohr <mohrr@google.com>
Reviewed-by: Wyatt Hepler <hepler@google.com>
Commit-Queue: Auto-Submit <auto-submit@pigweed.google.com.iam.gserviceaccount.com>
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 c84c796..e818e8f 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
@@ -37,9 +37,9 @@
     ]
   },
   {
-    "path": "infra/tools/protoc/${os}-${arch=amd64}",
+    "path": "infra/3pp/tools/protoc/${os}-${arch}",
     "tags": [
-      "protobuf_version:v3.8.0"
+      "version:3.14.0"
     ]
   },
   {