Update Edstem discussion link for 2024 FA semester

background/background.tex

@@ -845,7 +845,7 @@ \subsection{Watch the videos and write up your answers to the following question
 \url{http://cs-education.github.io/sys/}
 
 Questions? Comments? Use the current semester's CS341 Edstem:
-\url{https://edstem.org/us/courses/41378/discussion/}
+\url{https://edstem.org/us/courses/61021/discussion/}
 
 The in-browser virtual machine runs entirely in JavaScript and is fastest in Chrome.
 Note the VM and any code you write is reset when you reload the page, \textbf{so copy your code to a separate document.}