[roll third_party/pigweed] targets/rp2040: Update openocd flashing instructions

A custom build of openocd is no longer required for pico debuggers as
they now operate in CMSIS DAP mode.

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/210400
Lint: Lint 🤖 <android-build-ayeaye@system.gserviceaccount.com>

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 49dd44fcb1a0b68..a13c1efc6afb86f
Roller-URL: https://ci.chromium.org/b/8747442716372494193
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I1b9a9237a6f10db367377d3d17d1d908df56e993
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/examples/+/210513
Commit-Queue: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Lint: Lint 🤖 <android-build-ayeaye@system.gserviceaccount.com>
diff --git a/third_party/pigweed b/third_party/pigweed
index 49dd44f..a13c1ef 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 49dd44fcb1a0b68617329ac8c8c394c9255b12a7
+Subproject commit a13c1efc6afb86faf2a6b74044ed1d48a89f578f