Fix various hash function uses

Peter Eisentraut <peter@eisentraut.org>

Commit: 2ad6e80de9a6300daffcc0987667e45012fbecde
Author: Peter Eisentraut <peter@eisentraut.org>
Date: 2025-08-05T09:47:23Z
Fix various hash function uses

These instances were using Datum-returning functions where a
lower-level function returning uint32 would be more appropriate.

Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://www.postgresql.org/message-id/flat/8246d7ff-f4b7-4363-913e-827dadfeb145%40eisentraut.org

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