chore(sign_in_with_apple): Downgrade Flutter SDK to 3.19.0 #639

Job	Run time
Build sign_in_with_apple/sign_in_with_apple iOS on macos-13 with Xcode 15.2 and Flutter 3.19.1	4m 18s
Build sign_in_with_apple/sign_in_with_apple Android on ubuntu-22.04 and Flutter 3.19.1	3m 15s
Build sign_in_with_apple/sign_in_with_apple iOS on macos-14 with Xcode 14.3.1 and Flutter 3.19.1	3m 15s
Build sign_in_with_apple/sign_in_with_apple Web on ubuntu-22.04 and Flutter 3.19.1	1m 18s
Build sign_in_with_apple/sign_in_with_apple iOS on macos-14 with Xcode 15.2 and Flutter 3.19.1	3m 13s
Build sign_in_with_apple/sign_in_with_apple macOS on macos-13 with Xcode 15.2 and Flutter 3.19.1	3m 38s
Build sign_in_with_apple/sign_in_with_apple macOS on macos-14 with Xcode 14.3.1 and Flutter 3.19.1	4m 35s
Test pending_operations on ubuntu-22.04	1m 12s
Build sign_in_with_apple/sign_in_with_apple macOS on macos-14 with Xcode 15.2 and Flutter 3.19.1	5m 6s
Test sign_in_with_apple/sign_in_with_apple on ubuntu-22.04	1m 21s
Test sign_in_with_apple/sign_in_with_apple_platform_interface on ubuntu-22.04	1m 16s
Test state_queue_test on ubuntu-22.04	1m 14s
Test state_queue on ubuntu-22.04	1m 21s
Test with_bloc on ubuntu-22.04	1m 25s
Test pending_operations on macos-14	1m 46s
Test sign_in_with_apple/sign_in_with_apple on macos-14	1m 52s
Test sign_in_with_apple/sign_in_with_apple_platform_interface on macos-14	1m 50s
Test state_queue_test on macos-14	1m 49s
Test state_queue on macos-14	1m 47s
Test with_bloc on macos-14	1m 55s
	47m 26s

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