Fix warn message (pytorch#164367)

Fix warn message (pytorch#163578)

Pull Request resolved: pytorch#163578
Approved by: https://github.com/albanD, https://github.com/Skylion007, https://github.com/atalman, https://github.com/v0i0

(cherry picked from commit f3f67ff)

Co-authored-by: drisspg <[email protected]>

Author: pytorchbot

torch/nn/attention/flex_attention.py

@@ -1612,7 +1612,7 @@ def score_mod(
     elif return_lse and return_aux is None:
         _warn_once(
             "deprecated_return_lse",
-            "return_lse is deprecated and will be removed in v2.7. "
+            "return_lse is deprecated and will be removed in v2.10. "
             "Please use return_aux=AuxRequest(lse=True) instead.",
             category=FutureWarning,
         )