roll: pigweed, pw_toolchain: pw_build: Introduce pw_py_binary

This is a followup to http://pwrev.dev/215258: mark all Pigweed Python
binaries as incompatible with MCU devices.

Except for the changes to pw_build/python.bzl and pw_build/bazel.rst,
this CL was generated by running,

    /usr/bin/buildozer 'set kind pw_py_binary' //...:%py_binary
    /usr/bin/buildozer 'new_load //pw_build:python.bzl pw_py_binary' //...:__pkg__
    /usr/bin/buildozer 'fix unusedLoads' //...:__pkg__

Original-Bug: 258836641
Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/224296
Lint: Lint 🤖 <android-build-ayeaye@system.gserviceaccount.com>

https://pigweed.googlesource.com/pigweed/pigweed
pigweed, pw_toolchain Rolled-Commits: 4ce00e68e47e917..acbc017cab7db9b
Roller-URL: https://ci.chromium.org/b/8742029901600408833
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Id2baf4a03558ad1634eb1094ae626f8dd92eac72
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/quickstart/bazel/+/224511
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Commit-Queue: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
diff --git a/WORKSPACE b/WORKSPACE
index 3cd9fd9..8b85bb4 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -83,18 +83,18 @@
 git_repository(
     name = "pigweed",
     # ROLL: Warning: this entry is automatically updated.
-    # ROLL: Last updated 2024-07-18.
-    # ROLL: By https://cr-buildbucket.appspot.com/build/8742031257727080033.
-    commit = "4ce00e68e47e917768fb0726d3230164eb68054e",
+    # ROLL: Last updated 2024-07-19.
+    # ROLL: By https://cr-buildbucket.appspot.com/build/8742029901600408833.
+    commit = "acbc017cab7db9b388ff4634eb0857cebde1ba9e",
     remote = "https://pigweed.googlesource.com/pigweed/pigweed.git",
 )
 
 git_repository(
     name = "pw_toolchain",
     # ROLL: Warning: this entry is automatically updated.
-    # ROLL: Last updated 2024-07-18.
-    # ROLL: By https://cr-buildbucket.appspot.com/build/8742031257727080033.
-    commit = "4ce00e68e47e917768fb0726d3230164eb68054e",
+    # ROLL: Last updated 2024-07-19.
+    # ROLL: By https://cr-buildbucket.appspot.com/build/8742029901600408833.
+    commit = "acbc017cab7db9b388ff4634eb0857cebde1ba9e",
     remote = "https://pigweed.googlesource.com/pigweed/pigweed.git",
     strip_prefix = "pw_toolchain_bazel",
 )