Merge pull request #15942 from amoshydra/pin-pyarrow-20-rpi-compatibility

chore: pin pyarrow version to 20 for RPI compatibility

backend/requirements.txt

@@ -63,6 +63,7 @@ transformers
 sentence-transformers==4.1.0
 accelerate
 colbert-ai==0.2.21
+pyarrow==20.0.0
 einops==0.8.1