style: format scip.pyi with ruff

Delete an extraneous blank line between the end of ExprLike and the @disjoint_base decorator/Expr class in src/pyscipopt/scip.pyi to tidy file formatting. No functional changes.

Author: Zeroto521

src/pyscipopt/scip.pyi

@@ -346,7 +346,6 @@ class ExprLike:
     def sin(self) -> GenExpr: ...
     def cos(self) -> GenExpr: ...
 
-
 @disjoint_base
 class Expr(ExprLike):
     terms: Incomplete