fix(deps): Update dependency pyarrow to v21

Author: cq-bot

requirements.txt

@@ -2,5 +2,5 @@ black==25.1.0
 grpcio-tools==1.74.0
 grpcio==1.74.0
 protobuf>=6.30.0
-pyarrow==20.0.0
+pyarrow==21.0.0
 pytest==8.4.1