chore: updated vendored igraph to 0.10.15 #1687

Job	Run time
Build wheels on Linux (aarch64/musllinux)	0s
Build wheels on Linux (aarch64/manylinux)	0s
Build wheels on Linux (x86_64)	21m 59s
Build sdist and test extra dependencies	2m 26s
Build wheels on Linux (i686)	15m 53s
Build wheels on macOS (x86_64)	15m 29s
Build wheels for WebAssembly	6m 5s
Build wheels on macOS (arm64)	9m 8s
Build wheels on Windows (Win32)	8m 15s
Build with sanitizers for debugging purposes	5m 47s
Build wheels on Windows (x64)	23m 40s
	1h 48m 42s

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