Avoid default tokenization in Dask (#10398)

---------

Co-authored-by: Jiaming Yuan <jm.yuan@outlook.com>

python-package/xgboost/core.py

@@ -7,6 +7,7 @@ import json
 import os
 import re
 import sys
+import uuid
 import warnings
 import weakref
 from abc import ABC, abstractmethod
@@ -3143,3 +3144,9 @@ class Booster:
                 UserWarning,
             )
         return nph_stacked
+
+    def __dask_tokenize__(self) -> uuid.UUID:
+        # TODO: Implement proper tokenization to avoid unnecessary re-computation in
+        # Dask. However, default tokenzation causes problems after
+        # https://github.com/dask/dask/pull/10883
+        return uuid.uuid4()