LibJS: Port trivial use cases in the Intl namespace to String

Author: https://github.com/trflynn89
Commit: fc413711ee
Pull-request: https://github.com/SerenityOS/serenity/pull/17031
Reviewed-by: https://github.com/ADKaster
Reviewed-by: https://github.com/linusg

Userland/Libraries/LibJS/Runtime/Intl/SegmenterConstructor.cpp

@@ -81,7 +81,7 @@ ThrowCompletionOr<NonnullGCPtr<Object>> SegmenterConstructor::construct(Function
     auto granularity = TRY(get_option(vm, *options, vm.names.granularity, OptionType::String, { "grapheme"sv, "word"sv, "sentence"sv }, "grapheme"sv));
 
     // 13. Set segmenter.[[SegmenterGranularity]] to granularity.
-    segmenter->set_segmenter_granularity(TRY(granularity.as_string().deprecated_string()));
+    segmenter->set_segmenter_granularity(TRY(granularity.as_string().utf8_string_view()));
 
     // 14. Return segmenter.
     return segmenter;