[roll third_party/pigweed] pw_env_setup: Change case of armgcc version

http://fxrev.dev/959440 resulted in a change to the case of the tag.

Original-Bug: b/315998985
Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/184798

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: b1f00967b0ae131..67a1b8d9405dd8f
Roller-URL: https://ci.chromium.org/b/8761879050614334561
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I98008bb1cf2d2ac621169bf716f928a3aa9214f2
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/184801
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 b1f0096..67a1b8d 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit b1f00967b0ae131f99d3ce168f9119218be4e22e
+Subproject commit 67a1b8d9405dd8f3e95d71d385a9a53d3f4b7f51