Remove unused nullability in typeof (#25664)

Causes compilation error starting with dotnet SDK
6.0.100-rc.1.21417.19

src/EFCore.Relational/Query/Internal/FromSqlParameterExpandingExpressionVisitor.cs

@@ -168,7 +168,7 @@ public virtual SelectExpression Expand(
                         }
                     }
 
-                    return _visitedFromSqlExpressions[fromSql] = fromSql.Update(Expression.Constant(constantValues, typeof(object?[])));
+                    return _visitedFromSqlExpressions[fromSql] = fromSql.Update(Expression.Constant(constantValues, typeof(object[])));
 
                 default:
                     Check.DebugAssert(false, "FromSql.Arguments must be Constant/ParameterExpression");