roll: third_party/pigweed: bazel: Update to an unreleased version

This CL moves the upstream bazelversion to an unreleased commit which
addresses the remaining blockers for platform-based flags as well
as resolving a bug where bazel would crash on stale cache entries.

Original-Bug: b/352389854
Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/233032

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: faa7a78eab6a6c8..99acb268bf50ca0
Roller-URL: https://ci.chromium.org/b/8738129015780928289
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I66bb429614b5dc9c96fc8f3dc3cea17fdb3a8217
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/examples/+/232998
Commit-Queue: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Bot-Commit: 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 faa7a78..99acb26 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit faa7a78eab6a6c8c8ab623fa825ef80ef13f49f1
+Subproject commit 99acb268bf50ca0fb09e45b401d1b7aa4baa437f