bump ulab to fix rp2040 build error

jepler · jepler · commit 0f241c941542 · 2023-06-27T11:50:12.000-05:00
diff --git a/extmod/ulab b/extmod/ulab
@@ -1 +1 @@
-Subproject commit 319df10cfe9cb8f6e5e24627bda3fe1556d8b06b
+Subproject commit 3728d22732dedc8a591b7df18a16d3ef1aed6a39
