Replace gsl::span for std::span (c++20) (#7531)

* Replace gsl::span for std::span (c++20)
* Replace gsl::byte with std::byte

Co-authored-by: Bevan Weiss <bevan.weiss@gmail.com>

rpcs3/Emu/Cell/Modules/cellSysutil.cpp

@@ -10,7 +10,8 @@
 
 #include "Utilities/StrUtil.h"
 #include "Utilities/lockless.h"
-#include "Utilities/span.h"
+
+#include <span>
 
 LOG_CHANNEL(cellSysutil);
 
@@ -385,7 +386,7 @@ error_code cellSysutilGetSystemParamString(CellSysutilParamId id, vm::ptr<char>
 		cellSysutil.error("cellSysutilGetSystemParamString: Unknown ParamId 0x%x", id);
 	}
 
-	gsl::span dst(buf.get_ptr(), copy_size);
+	std::span dst(buf.get_ptr(), copy_size);
 	strcpy_trunc(dst, param_str);
 	return CELL_OK;
 }