bump submodule: - merchant - Merchant backend to process payments, run by merchants

commit b380a6077066d4e982e0a6f9e83457f3e4810351
parent 96b275a70cc671ae81177232f0aca02f12f45682
Author: Christian Grothoff <christian@grothoff.org>
Date:   Fri,  8 Sep 2023 19:58:22 +0200

bump submodule:

	merchant Merchant backend to process payments, run by merchants
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