Update dependency rules_python to v2.0.3

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
rules_python	bazel_dep	patch	2.0.2 → 2.0.3

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Release Notes

bazel-contrib/rules_python (rules_python)

v2.0.3

Compare Source

{#v2-0-3-fixed}

Fixed

• (pypi) Assume that all of the packages are available on a particular hub if
  there is only a single PyPI compatible index to be used. This saves us an expensive
  PyPI download and supports PyPI mirror implementations that do not support the root
  index functionality. Fixes #​3769.

{#v2-0-2}

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