Ignore type assessment in expressions.py

Author: bobbyxng

linopy/expressions.py

@@ -2384,7 +2384,7 @@ def merge(
     has_quad_expression = any(type(e) is QuadraticExpression for e in exprs)
     has_linear_expression = any(type(e) is LinearExpression for e in exprs)
     if cls is None:
-        cls = QuadraticExpression if has_quad_expression else LinearExpression
+        cls = QuadraticExpression if has_quad_expression else LinearExpression  # type: ignore[assignment]
 
     if cls is QuadraticExpression and dim == TERM_DIM and has_linear_expression:
         raise ValueError(