[Bazel] Remove implicit __init__.py creation

[RyanDraves]

The py_binary targets use implicit __init__.py creation, which on the latest rules_python, causes considerable warning spam:

DEBUG: /private/var/tmp/_bazel_user/86369c54f74076c704937def07bebfcf/external/rules_python+/python/private/py_executable.bzl:1498:14: 
======================================================================
WARNING: Target @@picotool+//bazel:jsonh is using implicit __init__.py creation.
  This diabolic behavior is deprecated and will be disabled by default in a
  future release.
  See https://github.com/bazel-contrib/rules_python/issues/2945

  Ensure all __init__.py files are explicitly created and
  added to the srcs or deps of your targets.

  Disable implicit creation by setting:
    legacy_create_init = 0
  on the target, or globally by setting:
    --incompatible_default_to_explicit_init_py
======================================================================

These flags silence the warning, although I'm not totally certain why it appeared at all. These are standalone scripts that only import from the stdlib.

[github-actions]

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