No constraints to torch version in requirements.txt

Now that pytorch/pytorch#138333 is fixed,
commit 24fd0d8 can be reverted.

Author: guitargeek

requirements.txt

@@ -12,7 +12,7 @@ onnx
 # TMVA: PyMVA interfaces
 scikit-learn
 tensorflow<2.16 ; python_version < "3.12"
-torch<2.5 ; python_version < "3.13" # no torch version that fullfills version constraint available for Python 3.13
+torch
 xgboost
 
 # PyROOT: ROOT.Numba.Declare decorator