chore: bump macos from 12 to 13 in CI #342

Job	Run time
pr-ci-verification / verification (AwsEncryptionSDK, macos-13)	16m 29s
pr-ci-codegen / code-generation (AwsEncryptionSDK, 6.0.x, ubuntu-latest)	3m 0s
pr-ci-net / testDotNet (windows-latest)	8m 48s
pr-ci-net / testDotNet (ubuntu-latest)	4m 40s
pr-ci-net / testDotNet (macos-13)	5m 38s
pr-test-vectors / decrypt_python_vectors (windows-latest)	8m 48s
pr-test-vectors / generate_vectors (ubuntu-latest)	4m 24s
pr-test-vectors / decrypt_python_vectors (ubuntu-latest)	6m 37s
pr-test-vectors / generate_vectors (macos-13)	6m 18s
pr-test-vectors / decrypt_python_vectors (macos-13)	8m 18s
pr-test-vectors / decrypt_net_vectors_with_js (ubuntu-latest)	45s
pr-test-vectors / decrypt_net_vectors_with_js (macos-13)	1m 30s
	1h 15m 15s

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