roll: third_party/pigweed: Revert "roll: bazel"

This reverts commit 127b5fe73746c3858819beaad83d0416014ce627.

Reason for revert: broke things, should not have landed

Original change's description:
> roll: bazel
>
> From: version:2@7.1.2.7
> To: version:2@7.2.0.7
> Roller-URL: https://ci.chromium.org/b/8745043135247461473
> CQ-Do-Not-Cancel-Tryjobs: true
> Change-Id: Ib7d2d6ec5569c7c0c6766d4a9feae482aba116fd
> Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/216334
> Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
> Commit-Queue: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
> Lint: Lint 🤖 <android-build-ayeaye@system.gserviceaccount.com>

# Not skipping CQ checks because original CL landed > 1 day ago.

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/216312
Lint: Lint 🤖 <android-build-ayeaye@system.gserviceaccount.com>

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 8059f92ef1a93df..76f06970fcdd064
Roller-URL: https://ci.chromium.org/b/8744858332673646737
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Idc2628285ad8479b44b6f8e578de24fc4e73f33e
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/216393
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Commit-Queue: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Lint: Lint 🤖 <android-build-ayeaye@system.gserviceaccount.com>
diff --git a/third_party/pigweed b/third_party/pigweed
index 8059f92..76f0697 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 8059f92ef1a93df94bf7a1fa2d3cae46cf689f30
+Subproject commit 76f06970fcdd064f7a85d3d8ffe779a1cfa91b69