Update python/pyarrow-stubs/_compute.pyi

Co-authored-by: Dan Redding <125183946+dangotbanned@users.noreply.github.com>

Author: rok

python/pyarrow-stubs/_compute.pyi

@@ -51,7 +51,8 @@ class Function(lib._Weakrefable):
     def name(self) -> str: ...
     @property
     def num_kernels(self) -> int: ...
-
+    @property
+    def kernels(self) -> list[ScalarKernel | VectorKernel | ScalarAggregateKernel | HashAggregateKernel]:
     def call(
         self,
         args: Iterable,