LibWeb: Port HTMLToken::to_deprecated_string to new AK String

Author: https://github.com/shannonbooth
Commit: 1f8d72da8e
Pull-request: https://github.com/SerenityOS/serenity/pull/21815
Reviewed-by: https://github.com/awesomekling

Userland/Libraries/LibWeb/HTML/Parser/HTMLParser.cpp

@@ -179,7 +179,7 @@ void HTMLParser::run()
             break;
         auto& token = optional_token.value();
 
-        dbgln_if(HTML_PARSER_DEBUG, "[{}] {}", insertion_mode_name(), token.to_deprecated_string());
+        dbgln_if(HTML_PARSER_DEBUG, "[{}] {}", insertion_mode_name(), token.to_string());
 
         // https://html.spec.whatwg.org/multipage/parsing.html#tree-construction-dispatcher
         // As each token is emitted from the tokenizer, the user agent must follow the appropriate steps from the following list, known as the tree construction dispatcher: