Bump unison subdir

ChrisPenner · ChrisPenner · commit cd57d59e90e8 · 2024-05-17T09:59:30.000-07:00
diff --git a/unison b/unison
@@ -1 +1 @@
-Subproject commit a4a1dcfd8dd0f95754aa7eabacba0372a8d97256
+Subproject commit 6b6cd4581de0573235eb5b4e0b4179281ae3a67a
