pw_package: Add missing python dep

Adds missing python dep to pw_package's python target.

Change-Id: Ia93d6ad0e2e233702e5ced62a68fdfff3d48a048
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/33960
Pigweed-Auto-Submit: Armando Montanez <amontanez@google.com>
Reviewed-by: Anthony DiGirolamo <tonymd@google.com>
Reviewed-by: Rob Mohr <mohrr@google.com>
Commit-Queue: Auto-Submit <auto-submit@pigweed.google.com.iam.gserviceaccount.com>
diff --git a/pw_package/py/BUILD.gn b/pw_package/py/BUILD.gn
index 309ab2f..dde870b 100644
--- a/pw_package/py/BUILD.gn
+++ b/pw_package/py/BUILD.gn
@@ -28,4 +28,5 @@
     "pw_package/pigweed_packages.py",
   ]
   pylintrc = "$dir_pigweed/.pylintrc"
+  python_deps = [ "$dir_pw_arduino_build/py" ]
 }