chore(deps): update dependency pyarrow to v21

| datasource | package | from   | to     |
| ---------- | ------- | ------ | ------ |
| pypi       | pyarrow | 19.0.1 | 21.0.0 |

Author: dreadnode-renovate-bot[bot]

poetry.lock

@@ -46,7 +46,7 @@ pandas-stubs = "^2.2.3.250308"
 types-requests = "^2.32.0.20250306"
 typer = "^0.15.2"
 datasets = "^3.5.0"
-pyarrow = "^19.0.1"
+pyarrow = "^21.0.0"
 
 [build-system]
 requires = ["poetry-core>=1.0.0", "setuptools>=42", "wheel"]