[roll third_party/pigweed] pw_rpc: Make log messages more specific

Also remove unnecessary pylint: disable comment.

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/39641

third_party/pigweed Rolled-Commits: 0616ee33d584658..c2a520cd98e37ae
Roller-URL: https://ci.chromium.org/b/8851038722373428144
Cq-Cl-Tag: roller-builder:pigweed-experimental-roller
Cq-Cl-Tag: roller-bid:8851038722373428144
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I299726a05dfbd2b7d4eee2da1d3535fa54fff508
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/39902
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 0616ee3..c2a520c 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 0616ee33d58465873a8f9ba53ba2f8ac205a8f6b
+Subproject commit c2a520cd98e37aed511134ab0fd2a25a2ebe548a