chore(deps): update io_bazel_rules_python commit hash to 640e88a

[renovate-bot]

This PR contains the following updates:

Package	Type	Update	Change
io_bazel_rules_python	git_repository	digest	3886b1a -> 640e88a

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[APPROVALNOTIFIER] This PR is APPROVED

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[smukherj1]

/ok-to-test

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