fix: fix signature of Graph.simple_cycles(), closes #856 #1985

Job	Run time
Build wheels on Linux (x86_64)	22m 36s
Build wheels on Linux (aarch64/musllinux)	5m 6s
Build wheels for WebAssembly	8m 0s
Build wheels on Linux (aarch64/manylinux)	12m 5s
Build wheels on Windows (ARM64)	13m 35s
Build wheels on Windows (x64)	22m 55s
Build sdist and test extra dependencies	3m 29s
Build wheels on macOS (arm64)	9m 43s
Build wheels on Windows (Win32)	9m 20s
Build wheels on macOS (x86_64)	9m 28s
Build with sanitizers for debugging purposes	4m 36s
	2h 0m 53s

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