chore: Update vendored sources to igraph/igraph@a9ca8a74eb8cfeefe7e46… #1550
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…193f7f524b2039fe20e
fix: fix handling of small vertex counts (zero and one) for centralization tmax functions
docs: improve centralization docs
fuzzer: use libxml2 2.13.4 [skip ci]
@krlmlr @maelle This brings a C core bugfix I made today to R/igraph. I recommend inclusion in 2.1.0. The chance for revdepcheck failures is rather low, and if they do occur, it's because other packages were expecting invalid values from igraph.