INTPYTHON-694 Support PyArrow 21.0 (#337)

Author: blink1073

bindings/python/pyproject.toml

@@ -6,7 +6,7 @@ requires = [
     # Needed for numpy headers.
     "numpy>=2.0",
     # Must be kept in sync with "project.dependencies" below.
-    "pyarrow>=20.0,<20.1.0",
+    "pyarrow>=21.0,<21.1.0",
 ]
 
 [project]
@@ -37,7 +37,7 @@ readme = "README.md"
 requires-python = ">=3.9"
 dependencies = [
     # Must be kept in sync with "build_sytem.requires" above.
-    "pyarrow >=20.0,<20.1",
+    "pyarrow >=21.0,<21.1",
     "pymongo >=4.4,<5",
     "numpy>=2.0.1",
     "packaging >=23.2",