Mark repository as unmaintained (#1844) #534

Job	Run time
windows-latest (host=x64, target=x64)	3m 0s
macos-latest (host=x64, target=x64)	49s
macos-m1 (host=arm64, target=arm64)	1s
windows-latest (host=x86, target=x86)	3m 27s
ubuntu-20.04 (host=x64, target=x64)	1s
${{ matrix.variant }} (node=${{ matrix.node }}, target=${{ matrix.target }})	0s
	7m 18s

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