[roll third_party/pigweed] pw_protobuf_compiler: Depend on Python package

When pw_proto_library Python packages are nested in another package,
have the .python subtarget wrap the package in which they're nested.
pw_proto_library targets originally disabled the .python subtarget when
the proto library was nested in another Python package. This made having
one pw_proto_library target depend on another difficult, and created
an error condition that didn't need to exist.

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/47760

third_party/pigweed Rolled-Commits: be3390bb6c62cee..b2062fd8d667a6f
Roller-URL: https://ci.chromium.org/b/8845325805387186528
Cq-Cl-Tag: roller-builder:pigweed-experimental-roller
Cq-Cl-Tag: roller-bid:8845325805387186528
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I6bb787157a41bc9af7d6c56d93e16c6bede95cd2
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/47887
Reviewed-by: Pigweed Integration Roller <pigweed-integration-roller@pigweed.google.com.iam.gserviceaccount.com>
Commit-Queue: Pigweed Integration Roller <pigweed-integration-roller@pigweed.google.com.iam.gserviceaccount.com>
diff --git a/third_party/pigweed b/third_party/pigweed
index be3390b..b2062fd 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit be3390bb6c62cee53a4c5ea446dc45457465db92
+Subproject commit b2062fd8d667a6f46462adb28d6b13847d271cb2