Update LVGL with fix to stm32 build failure

amirgon · amirgon · commit af7522d7314f · 2021-10-04T00:58:03.000+03:00
diff --git a/lvgl b/lvgl
@@ -1 +1 @@
-Subproject commit e7ba9b93af5f3ca352c56cf0de6b51b6809a7f85
+Subproject commit b20a706112a3107db13bbd405991ece4cbe00a88
