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feat(hashmap): add HashMap::update to match Map::update API (#3583)

Ports the general-purpose update method from Map (LinkedHashMap) to HashMap.
The callback receives Some(current) if the key exists or None if absent,
and returns Some(new_value) to insert/update or None to remove/no-op.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

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