update STM32

[Arduino] / hardware / Arduino_STM32

diff --git a/hardware/Arduino_STM32 b/hardware/Arduino_STM32
index 501da92..b8d1cd4 160000 (submodule)
--- a/hardware/Arduino_STM32
+++ b/hardware/Arduino_STM32
@@ -1 +1 @@
-Subproject commit 501da92986e3885ac4c51fb05e4f84e342bed7ea
+Subproject commit b8d1cd472a4de1ef9a0ef6ef520b45d2e6c28620