Everywhere: Use ReadonlySpan<T> instead of Span<T const>

Author: https://github.com/MacDue
Commit: 63b11030f0
Pull-request: https://github.com/SerenityOS/serenity/pull/17328
Reviewed-by: https://github.com/trflynn89

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

@@ -269,7 +269,7 @@ bool is_valid_duration_record(Temporal::DurationRecord const& record)
 }
 
 // 1.1.6 GetDurationUnitOptions ( unit, options, baseStyle, stylesList, digitalBase, prevStyle ), https://tc39.es/proposal-intl-duration-format/#sec-getdurationunitoptions
-ThrowCompletionOr<DurationUnitOptions> get_duration_unit_options(VM& vm, String const& unit, Object const& options, StringView base_style, Span<StringView const> styles_list, StringView digital_base, StringView previous_style)
+ThrowCompletionOr<DurationUnitOptions> get_duration_unit_options(VM& vm, String const& unit, Object const& options, StringView base_style, ReadonlySpan<StringView> styles_list, StringView digital_base, StringView previous_style)
 {
     // 1. Let style be ? GetOption(options, unit, string, stylesList, undefined).
     auto style_value = TRY(get_option(vm, options, unit.to_deprecated_string(), OptionType::String, styles_list, Empty {}));