chore(deps): update dependency pyarrow to v21

Author: renovate-bot

samples/geography/requirements.txt

@@ -26,7 +26,7 @@ mypy-extensions==1.1.0
 packaging==25.0
 pandas==2.3.1
 proto-plus==1.26.1
-pyarrow==20.0.0
+pyarrow==21.0.0
 pyasn1==0.6.1
 pyasn1-modules==0.4.2
 pycparser==2.22