Add block ASCII art to Windows installer banner #22

Job	Run time
build (ubuntu-latest, linux, amd64, linux-amd64)	20s
build (ubuntu-latest, windows, amd64, windows-amd64.exe, zig)	1m 29s
build (macos-latest, darwin, arm64, darwin-arm64)	37s
release	6s
npm-publish	4s
	2m 36s

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