Update prettier feature

- The prettier feature doesn't seem to work, throwing an error that it
  cannot be resolved when trying to build the devcontainer.
- Let's update it to the one found on the
  https://containers.dev/features website (search for prettier to find
  the feature location).

.devcontainer/devcontainer.json

@@ -36,6 +36,6 @@
   },
   "features": {
     "ghcr.io/devcontainers/features/github-cli:1": {},
-    "ghcr.io/devcontainers-contrib/features/prettier:1": {}
+    "ghcr.io/devcontainers-community/npm-features/prettier:1": {}
   }
 }