Fix unknown "sh" language in the-ultimate-tech-stack

This could also be aliased similarly to "ts" in Code.tsx.  Anyway, without
this fix you'll get errors in the following commits.

md/blog/the-ultimate-tech-stack.md

@@ -174,7 +174,7 @@ Head to the GitHub repo to get started: [https://github.com/colinhacks/devii](ht
 
 To jump straight into the code, clone the repo and start the development server like so:
 
-```sh
+```bash
 git clone [email protected]:colinhacks/devii.git mysite
 cd mysite
 yarn