fix(pt): make int rcut safe after jit op

Author: iProzd

deepmd/pt/utils/neighbor_stat.py

@@ -44,7 +44,7 @@ def __init__(
         mixed_types: bool,
     ) -> None:
         super().__init__()
-        self.rcut = rcut
+        self.rcut = float(rcut)
         self.ntypes = ntypes
         self.mixed_types = mixed_types