python3Packages.torchsnapshot: fix torch.load call (#423123)

pkgs/development/python-modules/torchsnapshot/default.nix

@@ -33,6 +33,16 @@ buildPythonPackage rec {
     hash = "sha256-F8OaxLH8BL6MPNLFv1hBuVmeEdnEQ5w2Qny6by1wP6k=";
   };
 
+  # _pickle.UnpicklingError: Weights only load failed.
+  # torchsnapshot needs to adapt to the change of torch.load that occured in 2.6.0:
+  # https://pytorch.org/docs/stable/generated/torch.load.html
+  postPatch = ''
+    substituteInPlace torchsnapshot/io_preparers/object.py \
+      --replace-fail \
+        "torch.load(io.BytesIO(buf))" \
+        "torch.load(io.BytesIO(buf), weights_only=False)"
+  '';
+
   build-system = [
     setuptools
   ];