roll: third_party/pigweed docs: Fix 404ing rss.xml file

Original-Bug: 370814463
Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/239172
Presubmit-Verified: CQ Bot Account <pigweed-scoped@luci-project-accounts.iam.gserviceaccount.com>
Original-Revision: ff379a08515bde8149ec7f65e1ae39371df3166b

Rolled-Repo: https://pigweed.googlesource.com/pigweed/pigweed
Rolled-Commits: a388a2af4a8f34..ff379a08515bde
Roller-URL: https://ci.chromium.org/b/8735172877356207265
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Ia80eb1c2e59ba7ab5b46255678c71df7e1acba21
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/examples/+/239332
Lint: Lint 🤖 <android-build-ayeaye@system.gserviceaccount.com>
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 a388a2a..ff379a0 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit a388a2af4a8f3445b79e5fef35110f0e41f1d198
+Subproject commit ff379a08515bde8149ec7f65e1ae39371df3166b