update contrib/gana to b7320181c5e0d95c6f2e2a9e5c53dce0bc1a35a8 - exchange - Base system with REST service to issue digital coins, run by the payment service provider

commit 56318f53e201f0f91e6cd50d485f6ff44b8cf9d0
parent 1caeaec2573c33bc62966b58a703ee3f0fab5e70
Author: Thien-Thi Nguyen <ttn@gnuvola.org>
Date:   Sun, 21 Nov 2021 06:23:36 -0500

update contrib/gana to b7320181c5e0d95c6f2e2a9e5c53dce0bc1a35a8

	exchange Base system with REST service to issue digital coins, run by the payment service provider
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