Convert span with dynamic extent to static extent

In some places we know the size at compile time, so use that knowlage.

Signed-off-by: Ralph Sennhauser <ralph.sennhauser@gmail.com>

source/graphics/Font.cpp

@@ -528,7 +528,7 @@ void CFont::BlendGlyphBitmapToTextureRGBA(const FT_Bitmap& bitmap, int targetX,
 
 		for (uint x{0}; x != bitmap.width; ++x)
 		{
-			const std::span<u8> tempDstRow{dstRow + x * m_TextureFormatStride, 4};
+			const std::span<u8, 4> tempDstRow{dstRow + x * m_TextureFormatStride, 4};
 			u8 alpha{srcRow[x]};
 
 			const float srcAlpha{m_StrokeWidth > 0 ? (*m_GammaCorrectionLUT)[alpha] : alpha/255.0f};