fix: update zsh-plugins feature source to use the correct repository

Author: linuxdaemon

.devcontainer/devcontainer.json

@@ -6,7 +6,7 @@
     "dockerFile": "./Dockerfile",
     "context": "..",
     "features": {
-        "ghcr.io/devcontainers-contrib/features/zsh-plugins": {
+        "ghcr.io/devcontainers-extra/features/zsh-plugins": {
             "omzPlugins": "https://github.com/zsh-users/zsh-autosuggestions"
         },
         "ghcr.io/devcontainers/features/docker-in-docker": {}