[issue39605] Fix some casts to not cast away const

[Andy Lester]

Change by Andy Lester <andy at petdance.com>:


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keywords: +patch
pull_requests: +17827
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/18453

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39605>
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