Update requirements.txt

requirements.txt

@@ -25,7 +25,7 @@ sentencepiece>=0.2,<0.3
 scipy>=1.11,<1.28
 timm>=1.0.9,<2
 faiss-cpu>=1.7,<2
-networkx==2.9.1  # pinned for gruut compatibility
+networkx>=2.8.8,<3.0
 
 # --- Audio ---
 librosa>=0.10,<0.11