Bump maccore for device scheduling fix (#7027)

New commits in xamarin/maccore:

* xamarin/maccore@486ad67875 [device-builds] Fix if condition typo (double `[`) (#1985)
* xamarin/maccore@fda32707a7 [tests] Update (and hopefully simplify)  submission tests documentation wrt cerficates/profiles expiration (#1972)
* xamarin/maccore@f23cd3a194 Merge pull request #1977 from xamarin/swift-o-matic-protocol-list-enum-factory
* xamarin/maccore@aaa2bec8da Enum factory test
* xamarin/maccore@d3c7890df2 Merge pull request #1974 from xamarin/swift-o-matic-protocol-list-enum
* xamarin/maccore@436a376ab4 [provisioning-profiles] Add 'Developer ID Application' and 'Developer ID Installer' certificates. (#1975)
* xamarin/maccore@ddc68fc899 Support for protocol list types in enum payloads.

Diff: 4611683312..486ad67875

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 := 4611683312fd8ad4eb2b2c093e43a5f71405bdee
+NEEDED_MACCORE_VERSION := 486ad67875db90261f3c9818380b979db3094946
 NEEDED_MACCORE_BRANCH := master
 
 MACCORE_DIRECTORY := maccore