roll: third_party/pigweed: fuzztest: Update GN files for FuzzTest and Abseil

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/234453

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 54679d205e48883..77d4ffe19965706
Roller-URL: https://ci.chromium.org/b/8737491050774794657
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I1d4a742689267e4923a2181c011d44caed709482
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/234571
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Lint: Lint 🤖 <android-build-ayeaye@system.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 54679d2..77d4ffe 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 54679d205e4888302ab24882e6fb64bf8ba964c6
+Subproject commit 77d4ffe19965706ac82c54f590f1f5b58c68e2ad