[roll third_party/pigweed] seed: Fix pw_seed_index template deps

Ensure the SEED index is regenerated when any pw_seed targets change.

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/190675

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 0d764ab24825195..f5df52c1185e9ac
Roller-URL: https://ci.chromium.org/b/8756730320707724353
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I02b6d849691b46db44e30ced2d0ca543517c459e
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/190678
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 0d764ab..f5df52c 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 0d764ab2482519535d34b36d2fdb7b61aa26a092
+Subproject commit f5df52c1185e9acafcbce48b3da468102e64dda4