roll: third_party/pigweed: pw_toolchain: Color diagnostics in Bazel

- Enable color compiler diagnostics in Bazel.
- Update comment referring to duplicate bug.

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/217715

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 3bf60a7ec0808b4..519f0b724d9394c
Roller-URL: https://ci.chromium.org/b/8744210735598798897
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Ia0f6578c45c1ca2efaf50cd9c88f973c5f215256
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/examples/+/218031
Commit-Queue: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Lint: Lint 🤖 <android-build-ayeaye@system.gserviceaccount.com>
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
diff --git a/third_party/pigweed b/third_party/pigweed
index 3bf60a7..519f0b7 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 3bf60a7ec0808b4fa08c1f3b314973b9543f39ae
+Subproject commit 519f0b724d9394c9697e034b0aba773e4d60846d