Bump unison submodule up to syncv2/causal-negotiation

ChrisPenner · ChrisPenner · commit 181237e8a9bf · 2025-02-04T20:46:12.000-08:00
diff --git a/unison b/unison
@@ -1 +1 @@
-Subproject commit 57fa5aeac79e0b964ae82d7ed50f42aefe7441f5
+Subproject commit 9545065466f2c8117d3c005940c2f6796ed787c7
