fix: return overflow in `Icon::from_rgba` #2499

Job	Run time
fmt check	8s
test_tao_macros	38s
tests (windows, x86_64-pc-windows-msvc, windows-latest)	8m 16s
tests (ubuntu, x86_64-unknown-linux-gnu, ubuntu-latest)	4m 20s
tests (ubuntu-without-feat, x86_64-unknown-linux-gnu, ubuntu-latest, --no-default-features)	3m 59s
tests (macos, x86_64-apple-darwin, macos-latest)	1m 59s
tests (android, aarch64-linux-android, ubuntu-latest, apk --)	2m 27s
tests (ios, aarch64-apple-ios, macos-latest)	1m 8s
	22m 55s

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