Update link for github tutorials (carbon-design-system#2362)

Previous link gives 404

Co-authored-by: kodiakhq[bot] <49736102+kodiakhq[bot]@users.noreply.github.com>

src/pages/contributing/overview.mdx

@@ -64,7 +64,7 @@ Regardless of how you choose to contribute, we encourage you to open an issue as
 early as possible in the process.
 
 If working with GitHub sounds like a lot, check out
-[this free video series](https://egghead.io/series/how-to-contribute-to-an-open-source-project-on-github).
+[this free video series](https://egghead.io/courses/how-to-contribute-to-an-open-source-project-on-github).
 It's one of our favorite resources.
 
 ## The Carbon community