bump submodule - libeufin - Integration and sandbox testing for FinTech APIs and data formats

commit d4208079403ec187714a0ddd38105ba67c603b30
parent d1c4ffecfd306386d6d4c3acfb354a1c20e7f76b
Author: Christian Grothoff <christian@grothoff.org>
Date:   Mon, 22 Dec 2025 21:18:32 +0100

bump submodule

	libeufin Integration and sandbox testing for FinTech APIs and data formats
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