Fix UpdateExpression.VisitChildren to visit the setter column #33948
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The problem here was a bug in UpdateExpression.VisitChildren: for column setters, it was visiting the values but not the columns. In 9.0, our alias post-processing logic now replaces columns in the entire tree when rewriting aliases, but the columns inside UpdateExpression weren't being changed because of this, causing incorrect SQL.
Fixes #33937