Update dependency rules_python to v1.6.3

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This PR contains the following updates:

Package	Type	Update	Change
rules_python	bazel_dep	patch	1.6.1 -> 1.6.3

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Release Notes

bazel-contrib/rules_python (rules_python)

v1.6.3

Compare Source

{#v1-6-3-fixed}

Fixed

• (pypi) We now use the Minimal Version Selection (MVS) algorithm to select
  the right wheel when there are multiple wheels for the target platform
  (e.g. musllinux_1_1_x86_64 and musllinux_1_2_x86_64). If the user
  wants to set the minimum version for the selection algorithm, use the
  {attr}pip.defaults.whl_platform_tags attribute to configure that. If
  musllinux_*_x86_64 is specified, we will choose the lowest available
  wheel version. Fixes #​3250.

{#v1-6-0}

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This change is 

[jwnimmer-tri]

@jwnimmer-tri reviewed 2 of 2 files at r1, all commit messages.
Reviewable status: complete! all discussions resolved, platform LGTM from [jwnimmer-tri] (waiting on @renovate[bot])