Remove @disjoint_base decorator from UnaryExpr

The @disjoint_base decorator was removed from the UnaryExpr class in the type stub, possibly to correct or update the class hierarchy or decorator usage.

Author: Zeroto521

src/pyscipopt/scip.pyi

@@ -2162,7 +2162,6 @@ class Term:
     def __lt__(self, other: object) -> bool: ...
     def __ne__(self, other: object) -> bool: ...
 
-@disjoint_base
 class UnaryExpr(GenExpr):
     def __init__(self, *args: Incomplete, **kwargs: Incomplete) -> None: ...