update deltachat-core-rust submodule to 'dynamic libraries use dylib extension on Darwin'

deltachat-ios/libraries/deltachat-core-rust

@@ -1 +1 @@
-Subproject commit e9fe8ce1186fd4f56a54c4e58f78dcd277cf8ca4
+Subproject commit 969508ae3675c13f5e2baf319c9cd6c41ab2806a