Update string.h

Author: Enmk

clickhouse/columns/string.h

@@ -89,9 +89,6 @@ class ColumnString : public Column {
     /// Appends one element to the column.
     void Append(std::string&& steal_value);
 
-    /// Appends one element to the column.
-    void Append(const char* str);
-
     /// Appends one element to the column.
     /// If str lifetime is managed elsewhere and guaranteed to outlive the Block sent to the server
     void AppendNoManagedLifetime(std::string_view str);