Update libsession-util to 1.5.6 (#23)

SessionHero01 · SessionHero01 · web-flow · commit 1f75c062d321 · 2025-09-24T11:57:17.000+08:00
Co-authored-by: SessionHero01 &lt;SesshioHero01@getsession.org&gt;
diff --git a/libsession-util b/libsession-util
@@ -1 +1 @@
-Subproject commit 5e3835bcfa7202cf307bc299bb1e40e160e8d357
+Subproject commit c73fd92eb71e8108cc435fc640fbcb8faceacbb0
