Bump maccore to fix mlaunch

New commits in xamarin/maccore:

* xamarin/maccore@de616ca53e [mlaunch] Fix dependencies for Xcode 12.5 beta 1 (xamarin#2387)
* xamarin/maccore@e93375583c [Actions] Fix rebase trigger.
* xamarin/maccore@0dfeb85ff6 [CI][VSTS] Add information when the external tool fails. (xamarin#2377)
* xamarin/maccore@87e165fdbb Remove Vincent as a code owner 😞 (xamarin#2368)
* xamarin/maccore@55a700bb5b [build] Add /restore to Xamarin.Analysis build (xamarin#2366)
* xamarin/maccore@2d9f8a9685 Bump to xamarin/xamarin-analysis@95245313 (xamarin#2362)

Diff: https://github.com/xamarin/maccore/compare/428964bf32f06862eb4209129c6fb5b882c3b9be..de616ca53e22ebea66216374a15b8caf2ca77e3c

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 := 428964bf32f06862eb4209129c6fb5b882c3b9be
+NEEDED_MACCORE_VERSION := de616ca53e22ebea66216374a15b8caf2ca77e3c
 NEEDED_MACCORE_BRANCH := d16-9
 
 MACCORE_DIRECTORY := maccore