Bump maccore to get ADR fix.

New commits in xamarin/maccore:

* xamarin/maccore@be56c3f82e [apple-doc-reader] Add support for Xcode 16.

Diff: 05609a3441..be56c3f82e

mk/xamarin.mk

@@ -7,7 +7,7 @@ MONO_BRANCH    := $(shell cd $(MONO_PATH) 2> /dev/null && git symbolic-ref --sho
 endif
 
 ifdef ENABLE_XAMARIN
-NEEDED_MACCORE_VERSION := 05609a34411fc8a0bc5224dabd2e6897e65167cf
+NEEDED_MACCORE_VERSION := be56c3f82e4071b5df0f7fbcdde22f164c915234
 NEEDED_MACCORE_BRANCH := main
 
 MACCORE_DIRECTORY := maccore