8spd to 11spd upgrade
As can you see here, for every increase in cog numbers there is also a increase in freehub width. So yeah, you will have to find another hub or freehub body. Changing only the freehub assembly depends on the model you have, but in general it is possible. Since your bike is kinda lower end (no offense), I would say you should do the math to see if it is actually worth it, instead of simply buying a new, better hub.