refactor: enable perl signature Producers.pm (#7194)
refactor: enable perl signature Producers.pm (#7194)

Replacing "shift" prototypes with perl signatures.
openfoodfacts/openfoodfacts-server,openfoodfacts/openfoodfacts-server,openfoodfacts/openfoodfacts-server,openfoodfacts/openfoodfacts-server,openfoodfacts/openfoodfacts-server