roll: pw_toolchain, pw_toolchain: rp2040: Add a bazel rule for flashing

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/216314
Lint: Lint 🤖 <android-build-ayeaye@system.gserviceaccount.com>

https://pigweed.googlesource.com/pigweed/pigweed
pw_toolchain, pw_toolchain Rolled-Commits: 23df123c1a72c91..d9bba5855b72a9f
Roller-URL: https://ci.chromium.org/b/8744571297921484801
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Icfae327517305ac5a195ffc4c2527dcdab519f1f
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/quickstart/bazel/+/217292
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/WORKSPACE b/WORKSPACE
index 030cbb7..fb74115 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -84,8 +84,8 @@
     name = "pigweed",
     # ROLL: Warning: this entry is automatically updated.
     # ROLL: Last updated 2024-06-20.
-    # ROLL: By https://cr-buildbucket.appspot.com/build/8744571690540466705.
-    commit = "23df123c1a72c91410d31cb0650b1c9bf8b617d4",
+    # ROLL: By https://cr-buildbucket.appspot.com/build/8744571297921484801.
+    commit = "d9bba5855b72a9f86e2fceea57aa193ae7ef93b7",
     remote = "https://pigweed.googlesource.com/pigweed/pigweed.git",
 )
 
@@ -93,8 +93,8 @@
     name = "pw_toolchain",
     # ROLL: Warning: this entry is automatically updated.
     # ROLL: Last updated 2024-06-20.
-    # ROLL: By https://cr-buildbucket.appspot.com/build/8744571690540466705.
-    commit = "23df123c1a72c91410d31cb0650b1c9bf8b617d4",
+    # ROLL: By https://cr-buildbucket.appspot.com/build/8744571297921484801.
+    commit = "d9bba5855b72a9f86e2fceea57aa193ae7ef93b7",
     remote = "https://pigweed.googlesource.com/pigweed/pigweed.git",
     strip_prefix = "pw_toolchain_bazel",
 )