Bump mpy to 2.1.0-beta.3 commit.

microbit-matt-hillsdon · microbit-matt-hillsdon · commit 50e1240353e5 · 2022-09-16T15:00:14.000+01:00
diff --git a/lib/micropython-microbit-v2 b/lib/micropython-microbit-v2
@@ -1 +1 @@
-Subproject commit 804c5fee4fd12e786e3815ef37aaefd5649153fa
+Subproject commit 6ea476f3ddb4eb7aba13ca264fab9d15abaae3ca
