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gh-152546: Refactor `mappingproxy.new` to use `PyDictProxy_New` #273137

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gh-152546: Refactor `mappingproxy.new` to use `PyDictProxy_New`

gh-152546: Refactor `mappingproxy.new` to use `PyDictProxy_New` #273137

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Unresolved review	3s
DO-NOT-MERGE	5s
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