Add missing \#include <span>

Without it, build fails with the following error: error: no template
named 'span' in namespace 'std'

include/hyprgraphics/resource/resources/ImageResource.hpp

@@ -1,6 +1,7 @@
 #pragma once
 
 #include <string>
+#include <span>
 #include <hyprutils/math/Vector2D.hpp>
 #include "./AsyncResource.hpp"
 #include "../../color/Color.hpp"

src/image/formats/Svg.hpp

@@ -3,6 +3,7 @@
 #include <cairo/cairo.h>
 #include <string>
 #include <expected>
+#include <span>
 #include <png.h>
 #include <hyprutils/math/Vector2D.hpp>