Use OS theme by default #88

Job	Run time
release (ubuntu-latest, build-linux-x86_64)	6m 47s
release (windows-latest, build-windows-x86_64)	18m 12s
release (windows-11-arm, build-windows-arm64)	25m 1s
release (macos-latest, x86_64-apple-darwin, --target universal-apple-darwin, build-macos-universal)	9m 36s
release (ubuntu-24.04-arm, build-linux-arm64)	8m 12s
	1h 7m 48s

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