chore: update C core

szhorvat · szhorvat · commit ad4a3f5a8973 · 2025-07-27T11:03:49.000+08:00
diff --git a/vendor/source/igraph b/vendor/source/igraph
@@ -1 +1 @@
-Subproject commit 0119d1f0b2fca021eefac9e1aceba09f1b294808
+Subproject commit 9ce1e169536382e23e02d7310073adfe3bc2a9f5
