[FIX][15.0] purchase_sale_stock_inter_company: Change the action_done to _action_done method.

[bizzappdev]

On the 13 version, it was the action_done method for stock_picking from 14 onwards, it has been changed to _action_done.

Expected: when a Delivery order is processed, it should automatically validate the incoming shipment of intercompany

FYI odoo _action_done method link https://github.com/odoo/odoo/blob/15.0/addons/stock/models/stock_picking.py#L823

[github-actions[bot]]

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