chore: pin to use macos 12 in gh actions #4907

Job	Run time
prebuild	3m 14s
bundle-size-tests / Bundle size tests	1m 36s
license-test / License tests	23s
github-actions-test / Github Action format test	25s
dependency-review / Dependency Review	5s
tsc-compliance-test / TSC Compliance Test	32s
unit-tests / get-package-list / Get packages list	7s
unit-tests / Unit Test - @aws-amplify/adapter-nextjs	46s
unit-tests / Unit Test - @aws-amplify/analytics	53s
unit-tests / Unit Test - @aws-amplify/api	48s
unit-tests / Unit Test - @aws-amplify/api-graphql	1m 4s
unit-tests / Unit Test - @aws-amplify/api-rest	41s
unit-tests / Unit Test - @aws-amplify/auth	1m 35s
unit-tests / Unit Test - aws-amplify	56s
unit-tests / Unit Test - @aws-amplify/core	1m 16s
unit-tests / Unit Test - @aws-amplify/datastore	3m 31s
unit-tests / Unit Test - @aws-amplify/datastore-storage-adapter	51s
unit-tests / Unit Test - @aws-amplify/geo	42s
unit-tests / Unit Test - @aws-amplify/interactions	44s
unit-tests / Unit Test - @aws-amplify/notifications	1m 6s
unit-tests / Unit Test - @aws-amplify/predictions	46s
unit-tests / Unit Test - @aws-amplify/pubsub	49s
unit-tests / Unit Test - @aws-amplify/react-native	37s
unit-tests / Unit Test - @aws-amplify/rtn-push-notification	45s
unit-tests / Unit Test - @aws-amplify/rtn-web-browser	33s
unit-tests / Unit Test - @aws-amplify/storage	1m 1s
Unit and Bundle tests have passed	1s
ci - Unit and Bundle tests have passed	1s
	25m 48s

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