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Fix build errors when compiling in C++20 mode

C++20 removes the ability to stream char32_t characters.
This is the error I get when setting CMAKE_CXX_STANDARD
to 20.

    /Users/thrasher/Projects/sfml/test/System/String.test.cpp:32:52: error: overload resolution selected deleted operator '<<'
       32 |     stream << "[\\x" << std::uppercase << std::hex << character << ']';
          |     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ^  ~~~~~~~~~
    /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX15.2.sdk/usr/include/c++/v1/ostream:1009:31: note: candidate function [with _Traits = std::char_traits<char>] has been explicitly deleted
     1009 | basic_ostream<char, _Traits>& operator<<(basic_ostream<char, _Traits>&, char32_t) = delete;
          |                               ^

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