fix(deps): update dependency pyarrow to v21 (#41)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

pyproject.toml

@@ -11,7 +11,7 @@ dependencies = [
   "datafusion>=42.0.0",
   "pandas>=2.2.3",
   "polars>=1.19.0",
-  "pyarrow==18.1.0",
+  "pyarrow==21.0.0",
 ]
 classifiers = [
     "Programming Language :: Python :: 3",