[roll third_party/pigweed] pw_snapshot: bazel build file fixes

Depending on a particular subtarget trims the dependencies tree. It's
also required internally.

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/94102

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 38f1a8c747e219a..4375777a4bb3bab
Roller-URL: https://ci.chromium.org/b/8814425547231966849
Cq-Cl-Tag: roller-builder:pigweed-experimental-roller
Cq-Cl-Tag: roller-bid:8814425547231966849
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I05b571c53bbd3fe7ebacbe0084ac14c9f905381e
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/94247
Commit-Queue: Pigweed Integration Roller <pigweed-integration-roller@pigweed.google.com.iam.gserviceaccount.com>
Bot-Commit: Pigweed Integration Roller <pigweed-integration-roller@pigweed.google.com.iam.gserviceaccount.com>
diff --git a/third_party/pigweed b/third_party/pigweed
index 38f1a8c..4375777 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 38f1a8c747e219a06612ce7b8164ccb986328e5a
+Subproject commit 4375777a4bb3bab16e7513851dc81f413c96647e