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Fix Linux CI: Use cirrusci/flutter for arm64 build #6

Job	Run time
build (macos, x64, macos-15-intel)	8m 13s
build (macos, arm64, macos-14)	5m 16s
build (linux, x64, ubuntu-latest)	3m 8s
build (windows, x64, windows-latest)	5m 6s
build (linux, arm64, ubuntu-latest, true)	2m 52s
build (windows, arm64, windows-latest)	3m 46s
	28m 21s