Fix Windows build: remove icon generation, use committed icon.ico #10

Job	Run time
build (macos-latest, darwin, arm64)	43s
build (ubuntu-latest, linux, x64)	1m 36s
build (macos-latest, darwin, x64)	54s
build (windows-latest, win32, x64)	2m 26s
release	0s
	5m 39s

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