ulab: Update again

jepler · jepler · commit 543316a8fbaa · 2020-10-25T13:26:55.000-05:00
.. pull in various doc build fixes that prevented the previous commit from building.  This is still "0.54.5", the tag was updated in micropython-ulab (since no functional difference was introduced, only doc and CI differences, I imagine)
diff --git a/extmod/ulab b/extmod/ulab
@@ -1 +1 @@
-Subproject commit 7f2c1ae52bee57ce32ac0a74652610cc233d3442
+Subproject commit 8242b84753355433b61230ab6631c06e5ac77f35
