[Maccore] Bump maccore to fix governance issues. (#10101)

Commits:

* Insert keychain into search list without overwriting other keychains 243810037e
* Fix working in comment 243810037e
* Insert login keychain without overwriting other keychains in the search 7e6beed1d0
* Merge pull request #2332 from xamarin/yaml-pipeline-device-tests 7e6beed1d0
* Avoid adding duplicate keychains to keychain list (#2333) 7e6beed1d0
* [Governance] Fix some small polycheck issues. 51bea51d06
* [Governance] Fix some small polycheck issues. f490737c8e

Full diff: 6a86f16e0f..f490737c8e

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 := 6a86f16e0f8bf5cad707eb9bb145a40596a7f438
+NEEDED_MACCORE_VERSION := f490737c8e3a7ecedb6005bfc8cc9792fe046931
 NEEDED_MACCORE_BRANCH := main
 
 MACCORE_DIRECTORY := maccore