chore: checkout bdk-ffi @ v2.0.0 tag

thunderbiscuit · thunderbiscuit · commit 858a39f7883b · 2025-07-23T15:32:59.000-04:00
diff --git a/bdk-ffi b/bdk-ffi
@@ -1 +1 @@
-Subproject commit c8d08e9061b50bae139016243706d880687d748b
+Subproject commit 0256c27e8f16b8dc3d7f864f6d0e0355bba38f7b
