Bump poetry feature to new url for dev container (go-gitea#34787) (go-gitea#34790)

Backport go-gitea#34787 by @yp05327

Why:
I got this error when build dev container

![4be14223f83e4d19ff04b0b31e38b8fc](https://github.com/user-attachments/assets/6e14630f-e505-4a8c-819f-229efee67116)

It seems that the url of poetry feature was changed:
https://containers.dev/features

![image](https://github.com/user-attachments/assets/8d3d4beb-9344-494a-8176-80b6f52ad6af)

After change to the new one, it worked.

Co-authored-by: yp05327 <[email protected]>

Author: GiteaBot

.devcontainer/devcontainer.json

@@ -7,7 +7,7 @@
       "version": "20"
     },
     "ghcr.io/devcontainers/features/git-lfs:1.2.2": {},
-    "ghcr.io/devcontainers-contrib/features/poetry:2": {},
+    "ghcr.io/devcontainers-extra/features/poetry:2": {},
     "ghcr.io/devcontainers/features/python:1": {
       "version": "3.12"
     },