Bump backtrace-rs to enable Mach-O support on iOS.

cutsoy · cutsoy · commit 7d30c5365639 · 2020-10-23T13:47:09.000+02:00
diff --git a/library/backtrace b/library/backtrace
@@ -1 +1 @@
-Subproject commit a6dd47bd588c882e735675a1379d2b61719fa380
+Subproject commit 8b8ea53b56f519dd7780defdd4254daaec892584
